diff --git a/package-lock.json b/package-lock.json
index 9bd531c6..ec02805f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vscode-arduino",
-  "version": "0.2.19",
+  "version": "0.2.21",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -10,11 +10,11 @@
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       "dev": true,
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-        "css": "2.2.3",
-        "normalize-path": "2.1.1",
-        "source-map": "0.5.7",
-        "through2": "2.0.3"
+        "acorn": "^5.0.3",
+        "css": "^2.2.1",
+        "normalize-path": "^2.1.1",
+        "source-map": "^0.5.6",
+        "through2": "^2.0.3"
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@@ -23,10 +23,16 @@
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       "dev": true,
       "requires": {
-        "normalize-path": "2.1.1",
-        "through2": "2.0.3"
+        "normalize-path": "^2.0.1",
+        "through2": "^2.0.3"
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+    "@types/compare-versions": {
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+      "resolved": "https://registry.npmjs.org/@types/compare-versions/-/compare-versions-3.0.0.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-2.2.48.tgz",
@@ -50,7 +56,7 @@
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+        "mime-types": "~2.1.18",
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@@ -66,7 +72,7 @@
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       "dev": true,
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+        "acorn": "^4.0.3"
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@@ -83,7 +89,7 @@
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       "dev": true,
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+        "acorn": "^3.0.4"
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@@ -100,8 +106,8 @@
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       "requires": {
-        "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
+        "co": "^4.6.0",
+        "json-stable-stringify": "^1.0.1"
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@@ -116,9 +122,9 @@
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       "dev": true,
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-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
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@@ -127,7 +133,7 @@
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           "dev": true,
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+            "is-buffer": "^1.1.5"
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@@ -144,7 +150,7 @@
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+        "string-width": "^2.0.0"
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-            "strip-ansi": "4.0.0"
+            "is-fullwidth-code-point": "^2.0.0",
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@@ -175,7 +181,7 @@
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+            "ansi-regex": "^3.0.0"
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@@ -237,8 +243,8 @@
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       "requires": {
-        "micromatch": "3.1.10",
-        "normalize-path": "2.1.1"
+        "micromatch": "^3.1.4",
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       "dev": true,
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+        "sprintf-js": "~1.0.2"
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@@ -313,7 +319,7 @@
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-        "inherits": "2.0.3",
-        "minimalistic-assert": "1.0.1"
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
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       "dev": true,
       "requires": {
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-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
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-        "isobject": "3.0.1",
-        "mixin-deep": "1.3.1",
-        "pascalcase": "0.1.1"
+        "cache-base": "^1.0.1",
+        "class-utils": "^0.3.5",
+        "component-emitter": "^1.2.1",
+        "define-property": "^1.0.0",
+        "isobject": "^3.0.1",
+        "mixin-deep": "^1.2.0",
+        "pascalcase": "^0.1.1"
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+            "kind-of": "^6.0.0"
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+            "kind-of": "^6.0.0"
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-            "is-data-descriptor": "1.0.0",
-            "kind-of": "6.0.2"
+            "is-accessor-descriptor": "^1.0.0",
+            "is-data-descriptor": "^1.0.0",
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@@ -509,7 +515,7 @@
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       "optional": true,
       "requires": {
-        "tweetnacl": "0.14.5"
+        "tweetnacl": "^0.14.3"
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@@ -536,7 +542,7 @@
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       "requires": {
         "bytes": "3.0.0",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "debug": "2.6.9",
-        "depd": "1.1.2",
-        "http-errors": "1.6.3",
+        "depd": "~1.1.2",
+        "http-errors": "~1.6.3",
         "iconv-lite": "0.4.23",
-        "on-finished": "2.3.0",
+        "on-finished": "~2.3.0",
         "qs": "6.5.2",
         "raw-body": "2.3.3",
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-        "string-width": "2.1.1",
-        "term-size": "1.2.0",
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+        "camelcase": "^4.0.0",
+        "chalk": "^2.0.1",
+        "cli-boxes": "^1.0.0",
+        "string-width": "^2.0.0",
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+            "color-convert": "^1.9.0"
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@@ -644,7 +650,7 @@
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-        "randombytes": "2.0.6"
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-        "time-stamp": "1.1.0"
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-        "object-assign": "4.1.1"
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@@ -2481,10 +2492,10 @@
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-        "repeat-string": "1.6.1",
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-        "parseurl": "1.3.2",
-        "statuses": "1.4.0",
-        "unpipe": "1.0.0"
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
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+        "statuses": "~1.4.0",
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@@ -2531,8 +2542,8 @@
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-        "pinkie-promise": "2.0.1"
+        "path-exists": "^2.0.0",
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@@ -2541,10 +2552,10 @@
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-        "micromatch": "3.1.10",
-        "resolve-dir": "1.0.1"
+        "detect-file": "^1.0.0",
+        "is-glob": "^3.1.0",
+        "micromatch": "^3.0.4",
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@@ -2553,11 +2564,11 @@
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-        "parse-filepath": "1.0.2"
+        "expand-tilde": "^2.0.2",
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@@ -2578,10 +2589,10 @@
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-        "del": "2.2.2",
-        "graceful-fs": "4.1.11",
-        "write": "0.2.1"
+        "circular-json": "^0.3.1",
+        "del": "^2.0.2",
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@@ -2596,7 +2607,7 @@
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       "dev": true,
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+        "for-in": "^1.0.1"
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@@ -2611,9 +2622,9 @@
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       "dev": true,
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-        "asynckit": "0.4.0",
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@@ -2627,7 +2638,7 @@
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       "dev": true,
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+        "map-cache": "^0.2.2"
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@@ -2647,10 +2658,10 @@
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-        "rimraf": "2.6.2",
-        "underscore-plus": "1.6.8"
+        "async": "^1.5.2",
+        "mkdirp": "^0.5.1",
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+        "underscore-plus": "1.x"
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@@ -2665,8 +2676,8 @@
       "dev": true,
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-        "nan": "2.10.0",
-        "node-pre-gyp": "0.10.0"
+        "nan": "^2.9.2",
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@@ -2692,8 +2703,8 @@
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-            "readable-stream": "2.3.6"
+            "delegates": "^1.0.0",
+            "readable-stream": "^2.0.6"
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@@ -2706,7 +2717,7 @@
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           "dev": true,
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-            "balanced-match": "1.0.0",
+            "balanced-match": "^1.0.0",
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@@ -2770,7 +2781,7 @@
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+            "minipass": "^2.2.1"
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@@ -2785,14 +2796,14 @@
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-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wide-align": "1.1.2"
+            "aproba": "^1.0.3",
+            "console-control-strings": "^1.0.0",
+            "has-unicode": "^2.0.0",
+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1",
+            "wide-align": "^1.1.0"
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@@ -2801,12 +2812,12 @@
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-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
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@@ -2821,7 +2832,7 @@
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+            "safer-buffer": "^2.1.0"
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@@ -2830,7 +2841,7 @@
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+            "minimatch": "^3.0.4"
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@@ -2839,8 +2850,8 @@
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-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
+            "wrappy": "1"
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@@ -2859,7 +2870,7 @@
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-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
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@@ -2873,7 +2884,7 @@
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           "requires": {
-            "brace-expansion": "1.1.11"
+            "brace-expansion": "^1.1.7"
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@@ -2886,8 +2897,8 @@
           "bundled": true,
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-            "safe-buffer": "5.1.1",
-            "yallist": "3.0.2"
+            "safe-buffer": "^5.1.1",
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@@ -2896,7 +2907,7 @@
           "dev": true,
           "optional": true,
           "requires": {
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+            "minipass": "^2.2.1"
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@@ -2919,9 +2930,9 @@
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-            "debug": "2.6.9",
-            "iconv-lite": "0.4.21",
-            "sax": "1.2.4"
+            "debug": "^2.1.2",
+            "iconv-lite": "^0.4.4",
+            "sax": "^1.2.4"
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@@ -2930,16 +2941,16 @@
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-            "rc": "1.2.7",
-            "rimraf": "2.6.2",
-            "semver": "5.5.0",
-            "tar": "4.4.1"
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.0",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.1.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4"
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@@ -2948,8 +2959,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "abbrev": "1.1.1",
-            "osenv": "0.1.5"
+            "abbrev": "1",
+            "osenv": "^0.1.4"
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@@ -3275,8 +3286,8 @@
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@@ -3321,12 +3332,12 @@
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@@ -3335,10 +3346,10 @@
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@@ -3380,8 +3391,8 @@
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@@ -3392,7 +3403,7 @@
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@@ -3401,7 +3412,7 @@
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@@ -3410,7 +3421,7 @@
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@@ -3430,11 +3441,11 @@
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@@ -3479,9 +3490,9 @@
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@@ -3490,9 +3501,9 @@
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@@ -3509,7 +3520,7 @@
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@@ -3519,8 +3530,8 @@
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@@ -3531,7 +3542,7 @@
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@@ -3540,17 +3551,17 @@
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@@ -3571,24 +3582,24 @@
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-        "v8flags": "2.1.1",
-        "vinyl-fs": "0.3.14"
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@@ -3606,9 +3617,9 @@
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-        "stat-mode": "0.2.2",
-        "through2": "2.0.3"
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@@ -3617,9 +3628,9 @@
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-        "eslint": "3.19.0",
-        "gulp-util": "3.0.8"
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@@ -3628,9 +3639,9 @@
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-        "plugin-error": "0.1.2",
-        "streamfilter": "1.0.7"
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@@ -3639,8 +3650,8 @@
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@@ -3661,10 +3672,10 @@
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@@ -3679,8 +3690,8 @@
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-        "through2": "2.0.3",
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-        "source-map": "0.6.1",
-        "strip-bom-string": "1.0.0",
-        "through2": "2.0.3"
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+        "@gulp-sourcemaps/map-sources": "1.X",
+        "acorn": "5.X",
+        "convert-source-map": "1.X",
+        "css": "2.X",
+        "debug-fabulous": "1.X",
+        "detect-newline": "2.X",
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+        "strip-bom-string": "1.X",
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@@ -3775,10 +3786,10 @@
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-        "queue": "3.1.0",
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@@ -3802,9 +3813,9 @@
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-            "preserve": "0.2.0",
-            "repeat-element": "1.1.2"
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@@ -3813,7 +3824,7 @@
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@@ -3831,11 +3842,11 @@
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-            "path-is-absolute": "1.0.1"
+            "inflight": "^1.0.4",
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@@ -3844,14 +3855,14 @@
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@@ -3860,10 +3871,10 @@
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@@ -3872,8 +3883,8 @@
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@@ -3884,11 +3895,11 @@
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@@ -3948,8 +3959,8 @@
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@@ -3973,8 +3984,8 @@
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-            "through2-filter": "2.0.0"
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@@ -3983,8 +3994,8 @@
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-            "clone": "1.0.4",
-            "clone-stats": "0.0.1",
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-            "graceful-fs": "4.1.11",
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-            "through2": "2.0.3",
-            "through2-filter": "2.0.0",
-            "vali-date": "1.0.0",
-            "vinyl": "1.2.0"
+            "is-valid-glob": "^0.3.0",
+            "lazystream": "^1.0.0",
+            "lodash.isequal": "^4.0.0",
+            "merge-stream": "^1.0.0",
+            "mkdirp": "^0.5.0",
+            "object-assign": "^4.0.0",
+            "readable-stream": "^2.0.4",
+            "strip-bom": "^2.0.0",
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+            "through2": "^2.0.0",
+            "through2-filter": "^2.0.0",
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@@ -4021,9 +4032,9 @@
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-        "map-stream": "0.1.0",
-        "through": "2.3.8"
+        "gulp-util": "~3.0.8",
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-        "through2": "2.0.3",
-        "vinyl-fs": "2.4.4"
+        "gulp-util": "~3.0.7",
+        "source-map": "~0.5.3",
+        "through2": "~2.0.1",
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@@ -4044,7 +4055,7 @@
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           "dev": true,
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@@ -4059,9 +4070,9 @@
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-            "preserve": "0.2.0",
-            "repeat-element": "1.1.2"
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@@ -4070,7 +4081,7 @@
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@@ -4079,7 +4090,7 @@
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           "dev": true,
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@@ -4088,11 +4099,11 @@
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-            "path-is-absolute": "1.0.1"
+            "inflight": "^1.0.4",
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@@ -4101,14 +4112,14 @@
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+            "glob-parent": "^3.0.0",
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@@ -4117,10 +4128,10 @@
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+                "readable-stream": ">=1.0.33-1 <1.1.0-0",
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@@ -4141,11 +4152,11 @@
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-            "through2": "2.0.3",
-            "vinyl": "1.2.0"
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@@ -4160,7 +4171,7 @@
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@@ -4184,19 +4195,19 @@
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-            "object.omit": "2.0.1",
-            "parse-glob": "3.0.4",
-            "regex-cache": "0.4.4"
+            "arr-diff": "^2.0.0",
+            "array-unique": "^0.2.1",
+            "braces": "^1.8.2",
+            "expand-brackets": "^0.1.4",
+            "extglob": "^0.3.1",
+            "filename-regex": "^2.0.0",
+            "is-extglob": "^1.0.0",
+            "is-glob": "^2.0.1",
+            "kind-of": "^3.0.2",
+            "normalize-path": "^2.0.1",
+            "object.omit": "^2.0.0",
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@@ -4205,8 +4216,8 @@
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+            "is-stream": "^1.0.1",
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@@ -4221,7 +4232,7 @@
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           "dev": true,
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-            "through2-filter": "2.0.0"
+            "json-stable-stringify": "^1.0.0",
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@@ -4240,8 +4251,8 @@
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-            "clone": "1.0.4",
-            "clone-stats": "0.0.1",
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-            "glob-stream": "5.3.5",
-            "graceful-fs": "4.1.11",
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-            "vali-date": "1.0.0",
-            "vinyl": "1.2.0"
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+            "lazystream": "^1.0.0",
+            "lodash.isequal": "^4.0.0",
+            "merge-stream": "^1.0.0",
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+            "through2-filter": "^2.0.0",
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-        "streamifier": "0.1.1",
-        "tar": "2.2.1",
-        "through2": "2.0.3",
-        "vinyl": "1.2.0"
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+        "tar": "^2.2.1",
+        "through2": "~2.0.3",
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@@ -4291,8 +4302,8 @@
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-            "clone": "1.0.4",
-            "clone-stats": "0.0.1",
+            "clone": "^1.0.0",
+            "clone-stats": "^0.0.1",
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@@ -4304,24 +4315,24 @@
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-        "minimist": "1.2.0",
-        "multipipe": "0.1.2",
-        "object-assign": "3.0.0",
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+        "array-uniq": "^1.0.2",
+        "beeper": "^1.0.0",
+        "chalk": "^1.0.0",
+        "dateformat": "^2.0.0",
+        "fancy-log": "^1.1.0",
+        "gulplog": "^1.0.0",
+        "has-gulplog": "^0.1.0",
+        "lodash._reescape": "^3.0.0",
+        "lodash._reevaluate": "^3.0.0",
+        "lodash._reinterpolate": "^3.0.0",
+        "lodash.template": "^3.0.0",
+        "minimist": "^1.1.0",
+        "multipipe": "^0.1.2",
+        "object-assign": "^3.0.0",
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-        "vinyl": "0.5.3"
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@@ -4344,13 +4355,13 @@
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-        "vinyl": "2.2.0",
-        "vinyl-fs": "2.4.4",
-        "yauzl": "2.9.2",
-        "yazl": "2.4.3"
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+        "queue": "^4.2.1",
+        "through2": "^2.0.3",
+        "vinyl": "^2.0.2",
+        "vinyl-fs": "^2.0.0",
+        "yauzl": "^2.2.1",
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@@ -4359,7 +4370,7 @@
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           "dev": true,
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@@ -4374,9 +4385,9 @@
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-            "preserve": "0.2.0",
-            "repeat-element": "1.1.2"
+            "expand-range": "^1.8.1",
+            "preserve": "^0.2.0",
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@@ -4397,7 +4408,7 @@
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           "dev": true,
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+            "is-posix-bracket": "^0.1.0"
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@@ -4406,7 +4417,7 @@
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           "dev": true,
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-            "is-extglob": "1.0.0"
+            "is-extglob": "^1.0.0"
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@@ -4415,11 +4426,11 @@
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-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "2 || 3",
+            "once": "^1.3.0",
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@@ -4428,14 +4439,14 @@
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-            "through2": "0.6.5",
-            "to-absolute-glob": "0.1.1",
-            "unique-stream": "2.2.1"
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+            "glob": "^5.0.3",
+            "glob-parent": "^3.0.0",
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+            "ordered-read-streams": "^0.3.0",
+            "through2": "^0.6.0",
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@@ -4444,10 +4455,10 @@
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-                "inherits": "2.0.3",
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@@ -4456,8 +4467,8 @@
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               "dev": true,
               "requires": {
-                "readable-stream": "1.0.34",
-                "xtend": "4.0.1"
+                "readable-stream": ">=1.0.33-1 <1.1.0-0",
+                "xtend": ">=4.0.0 <4.1.0-0"
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@@ -4468,11 +4479,11 @@
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-            "through2": "2.0.3",
-            "vinyl": "1.2.0"
+            "convert-source-map": "^1.1.1",
+            "graceful-fs": "^4.1.2",
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+            "through2": "^2.0.0",
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@@ -4499,8 +4510,8 @@
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-                "clone": "1.0.4",
-                "clone-stats": "0.0.1",
+                "clone": "^1.0.0",
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@@ -4518,7 +4529,7 @@
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           "dev": true,
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+            "is-extglob": "^1.0.0"
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@@ -4533,7 +4544,7 @@
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           "dev": true,
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@@ -4542,19 +4553,19 @@
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-            "object.omit": "2.0.1",
-            "parse-glob": "3.0.4",
-            "regex-cache": "0.4.4"
+            "arr-diff": "^2.0.0",
+            "array-unique": "^0.2.1",
+            "braces": "^1.8.2",
+            "expand-brackets": "^0.1.4",
+            "extglob": "^0.3.1",
+            "filename-regex": "^2.0.0",
+            "is-extglob": "^1.0.0",
+            "is-glob": "^2.0.1",
+            "kind-of": "^3.0.2",
+            "normalize-path": "^2.0.1",
+            "object.omit": "^2.0.0",
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@@ -4563,8 +4574,8 @@
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-            "readable-stream": "2.3.6"
+            "is-stream": "^1.0.1",
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@@ -4573,7 +4584,7 @@
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@@ -4594,7 +4605,7 @@
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           "dev": true,
           "requires": {
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+            "is-utf8": "^0.2.0"
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@@ -4603,8 +4614,8 @@
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-            "through2-filter": "2.0.0"
+            "json-stable-stringify": "^1.0.0",
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@@ -4613,12 +4624,12 @@
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-            "cloneable-readable": "1.1.2",
-            "remove-trailing-separator": "1.1.0",
-            "replace-ext": "1.0.0"
+            "clone": "^2.1.1",
+            "clone-buffer": "^1.0.0",
+            "clone-stats": "^1.0.0",
+            "cloneable-readable": "^1.0.0",
+            "remove-trailing-separator": "^1.0.1",
+            "replace-ext": "^1.0.0"
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@@ -4627,23 +4638,23 @@
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-            "glob-stream": "5.3.5",
-            "graceful-fs": "4.1.11",
+            "duplexify": "^3.2.0",
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-            "through2": "2.0.3",
-            "through2-filter": "2.0.0",
-            "vali-date": "1.0.0",
-            "vinyl": "1.2.0"
+            "is-valid-glob": "^0.3.0",
+            "lazystream": "^1.0.0",
+            "lodash.isequal": "^4.0.0",
+            "merge-stream": "^1.0.0",
+            "mkdirp": "^0.5.0",
+            "object-assign": "^4.0.0",
+            "readable-stream": "^2.0.4",
+            "strip-bom": "^2.0.0",
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+            "through2": "^2.0.0",
+            "through2-filter": "^2.0.0",
+            "vali-date": "^1.0.0",
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@@ -4670,8 +4681,8 @@
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               "dev": true,
               "requires": {
-                "clone": "1.0.4",
-                "clone-stats": "0.0.1",
+                "clone": "^1.0.0",
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@@ -4685,7 +4696,7 @@
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       "dev": true,
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-        "glogg": "1.0.1"
+        "glogg": "^1.0.0"
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@@ -4700,8 +4711,8 @@
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       "dev": true,
       "requires": {
-        "ajv": "5.5.2",
-        "har-schema": "2.0.0"
+        "ajv": "^5.1.0",
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@@ -4710,10 +4721,10 @@
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-            "fast-deep-equal": "1.1.0",
-            "fast-json-stable-stringify": "2.0.0",
-            "json-schema-traverse": "0.3.1"
+            "co": "^4.6.0",
+            "fast-deep-equal": "^1.0.0",
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@@ -4724,7 +4735,7 @@
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       "dev": true,
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-        "function-bind": "1.1.1"
+        "function-bind": "^1.1.1"
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@@ -4733,7 +4744,7 @@
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       "dev": true,
       "requires": {
-        "ansi-regex": "2.1.1"
+        "ansi-regex": "^2.0.0"
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@@ -4748,7 +4759,7 @@
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       "dev": true,
       "requires": {
-        "sparkles": "1.0.1"
+        "sparkles": "^1.0.0"
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@@ -4757,9 +4768,9 @@
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       "dev": true,
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-        "has-values": "1.0.0",
-        "isobject": "3.0.1"
+        "get-value": "^2.0.6",
+        "has-values": "^1.0.0",
+        "isobject": "^3.0.0"
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@@ -4768,8 +4779,8 @@
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       "dev": true,
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-        "is-number": "3.0.0",
-        "kind-of": "4.0.0"
+        "is-number": "^3.0.0",
+        "kind-of": "^4.0.0"
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@@ -4778,7 +4789,7 @@
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           "dev": true,
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+            "is-buffer": "^1.1.5"
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@@ -4789,8 +4800,8 @@
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-        "safe-buffer": "5.1.2"
+        "inherits": "^2.0.1",
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@@ -4799,8 +4810,8 @@
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       "dev": true,
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-        "inherits": "2.0.3",
-        "minimalistic-assert": "1.0.1"
+        "inherits": "^2.0.3",
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@@ -4815,9 +4826,9 @@
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+        "memory-fs": "~0.4.1",
+        "mkdirp": "~0.5.0",
+        "node-libs-browser": "^2.0.0",
+        "source-map": "^0.5.3",
+        "supports-color": "^3.1.0",
+        "tapable": "~0.2.5",
+        "uglify-js": "^2.8.27",
+        "watchpack": "^1.3.1",
+        "webpack-sources": "^1.0.1",
+        "yargs": "^6.0.0"
       },
       "dependencies": {
         "async": {
@@ -8771,7 +8782,7 @@
           "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
           "dev": true,
           "requires": {
-            "lodash": "4.17.10"
+            "lodash": "^4.17.10"
           }
         },
         "has-flag": {
@@ -8786,7 +8797,7 @@
           "integrity": "sha1-ZawFBLOVQXHYpklGsq48u4pfVPY=",
           "dev": true,
           "requires": {
-            "has-flag": "1.0.0"
+            "has-flag": "^1.0.0"
           }
         }
       }
@@ -8797,8 +8808,8 @@
       "integrity": "sha512-aqYp18kPphgoO5c/+NaUvEeACtZjMESmDChuD3NBciVpah3XpMEU9VAAtIaB1BsfJWWTSdv8Vv1m3T0aRk2dUw==",
       "dev": true,
       "requires": {
-        "source-list-map": "2.0.0",
-        "source-map": "0.6.1"
+        "source-list-map": "^2.0.0",
+        "source-map": "~0.6.1"
       },
       "dependencies": {
         "source-map": {
@@ -8815,7 +8826,7 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -8830,7 +8841,7 @@
       "integrity": "sha1-AUKk6KJD+IgsAjOqDgKBqnYVInM=",
       "dev": true,
       "requires": {
-        "string-width": "2.1.1"
+        "string-width": "^2.1.1"
       },
       "dependencies": {
         "ansi-regex": {
@@ -8851,8 +8862,8 @@
           "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
           }
         },
         "strip-ansi": {
@@ -8861,7 +8872,7 @@
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "3.0.0"
+            "ansi-regex": "^3.0.0"
           }
         }
       }
@@ -8882,12 +8893,12 @@
       "resolved": "https://registry.npmjs.org/winston/-/winston-2.4.3.tgz",
       "integrity": "sha512-GYKuysPz2pxYAVJD2NPsDLP5Z79SDEzPm9/j4tCjkF/n89iBNGBMJcR+dMUqxgPNgoSs6fVygPi+Vl2oxIpBuw==",
       "requires": {
-        "async": "1.0.0",
-        "colors": "1.0.3",
-        "cycle": "1.0.3",
-        "eyes": "0.1.8",
-        "isstream": "0.1.2",
-        "stack-trace": "0.0.10"
+        "async": "~1.0.0",
+        "colors": "1.0.x",
+        "cycle": "1.0.x",
+        "eyes": "0.1.x",
+        "isstream": "0.1.x",
+        "stack-trace": "0.0.x"
       },
       "dependencies": {
         "async": {
@@ -8914,8 +8925,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       }
     },
     "wrappy": {
@@ -8929,7 +8940,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "write-file-atomic": {
@@ -8938,9 +8949,9 @@
       "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
       "dev": true,
       "requires": {
-        "graceful-fs": "4.1.11",
-        "imurmurhash": "0.1.4",
-        "signal-exit": "3.0.2"
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
       }
     },
     "xdg-basedir": {
@@ -8973,19 +8984,19 @@
       "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.2",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "4.2.1"
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^4.2.0"
       },
       "dependencies": {
         "camelcase": {
@@ -9000,9 +9011,9 @@
           "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
           "dev": true,
           "requires": {
-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wrap-ansi": "2.1.0"
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1",
+            "wrap-ansi": "^2.0.0"
           }
         },
         "load-json-file": {
@@ -9011,11 +9022,11 @@
           "integrity": "sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=",
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "parse-json": "2.2.0",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1",
-            "strip-bom": "2.0.0"
+            "graceful-fs": "^4.1.2",
+            "parse-json": "^2.2.0",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0",
+            "strip-bom": "^2.0.0"
           }
         },
         "path-type": {
@@ -9024,9 +9035,9 @@
           "integrity": "sha1-WcRPfuSR2nBNpBXaWkBwuk+P5EE=",
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1"
+            "graceful-fs": "^4.1.2",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0"
           }
         },
         "read-pkg": {
@@ -9035,9 +9046,9 @@
           "integrity": "sha1-9f+qXs0pyzHAR0vKfXVra7KePyg=",
           "dev": true,
           "requires": {
-            "load-json-file": "1.1.0",
-            "normalize-package-data": "2.4.0",
-            "path-type": "1.1.0"
+            "load-json-file": "^1.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^1.0.0"
           }
         },
         "read-pkg-up": {
@@ -9046,8 +9057,8 @@
           "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
           "dev": true,
           "requires": {
-            "find-up": "1.1.2",
-            "read-pkg": "1.1.0"
+            "find-up": "^1.0.0",
+            "read-pkg": "^1.0.0"
           }
         },
         "strip-bom": {
@@ -9056,7 +9067,7 @@
           "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
           "dev": true,
           "requires": {
-            "is-utf8": "0.2.1"
+            "is-utf8": "^0.2.0"
           }
         }
       }
@@ -9067,7 +9078,7 @@
       "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0"
+        "camelcase": "^3.0.0"
       },
       "dependencies": {
         "camelcase": {
@@ -9084,8 +9095,8 @@
       "integrity": "sha1-T7G8euH8L1cDe1SvasyP4QMcW3c=",
       "dev": true,
       "requires": {
-        "buffer-crc32": "0.2.13",
-        "fd-slicer": "1.1.0"
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
       }
     },
     "yazl": {
@@ -9094,7 +9105,7 @@
       "integrity": "sha1-7CblzIfVYBud+EMtvdPNLlFzoHE=",
       "dev": true,
       "requires": {
-        "buffer-crc32": "0.2.13"
+        "buffer-crc32": "~0.2.3"
       }
     },
     "zone.js": {
diff --git a/package.json b/package.json
index 344f80f2..49b46652 100644
--- a/package.json
+++ b/package.json
@@ -518,6 +518,7 @@
     "ms-vscode.cpptools"
   ],
   "devDependencies": {
+    "@types/compare-versions": "^3.0.0",
     "@types/mocha": "^2.2.32",
     "@types/node": "^6.0.40",
     "@types/winreg": "^1.2.30",
@@ -545,6 +546,7 @@
   },
   "dependencies": {
     "body-parser": "^1.16.1",
+    "compare-versions": "^3.4.0",
     "eventemitter2": "^4.1.0",
     "express": "^4.14.1",
     "glob": "^7.1.1",
diff --git a/src/extension.ts b/src/extension.ts
index 5aea3e6a..19a892dc 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -21,6 +21,7 @@ import { ArduinoDebugConfigurationProvider } from "./debug/configurationProvider
 import { DeviceContext } from "./deviceContext";
 import { CompletionProvider } from "./langService/completionProvider";
 import * as Logger from "./logger/logger";
+import { NSAT } from "./nsat";
 import { SerialMonitor } from "./serialmonitor/serialMonitor";
 import { UsbDetector } from "./serialmonitor/usbDetector";
 
@@ -73,6 +74,8 @@ export async function activate(context: vscode.ExtensionContext) {
             correlationId: guid,
             duration: timer1.end(),
         });
+
+        NSAT.takeSurvey(context);
     };
     const registerArduinoCommand = (command: string, commandBody: (...args: any[]) => any, getUserData?: () => any): number => {
         return context.subscriptions.push(vscode.commands.registerCommand(command, async (...args: any[]) => {
diff --git a/src/nsat.ts b/src/nsat.ts
new file mode 100644
index 00000000..d20d2a21
--- /dev/null
+++ b/src/nsat.ts
@@ -0,0 +1,87 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+"use strict";
+
+import * as compareVersions from "compare-versions";
+import {commands, ExtensionContext, extensions, Uri, window} from "vscode";
+import * as Logger from "./logger/logger";
+
+const IS_MUST_CANDIDATE_VERSION = false;
+const NSAT_SURVEY_URL = "https://www.surveymonkey.com/r/CC2GVRC";
+const PROBABILITY = 0.5;
+const SESSION_COUNT_THRESHOLD = 5;
+const SESSION_COUNT_KEY = "nsat/sessionCount";
+const LAST_SESSION_DATE_KEY = "nsat/lastSessionDate";
+const TAKE_SURVEY_DATE_KEY = "nsat/takeSurveyDate";
+const CANDIDATED_VERSION_KEY = "nsat/candidatedVersion";
+const EXTENSION_ID = "vsciot-vscode.vscode-arduino";
+
+export class NSAT {
+  public static async takeSurvey({globalState}: ExtensionContext) {
+    const extension = extensions.getExtension(EXTENSION_ID);
+    if (!extension) {
+      return;
+    }
+    const today = new Date().toDateString();
+    const epoch = new Date(0).toDateString();
+    const extensionVersion = extension.packageJSON.version;
+    const candidatedVersion = globalState.get<string>(CANDIDATED_VERSION_KEY);
+    if (candidatedVersion && candidatedVersion !== "remindmelater") {
+      if (candidatedVersion === "*" || !IS_MUST_CANDIDATE_VERSION || compareVersions(extensionVersion, candidatedVersion) <= 0) {
+        return;
+      }
+      globalState.update(LAST_SESSION_DATE_KEY, today);
+    }
+
+    const lastSessionDate =
+        globalState.get(LAST_SESSION_DATE_KEY, epoch);
+
+    if (today === lastSessionDate) {
+      return;
+    }
+
+    const sessionCount = globalState.get(SESSION_COUNT_KEY, 0) + 1;
+    await globalState.update(LAST_SESSION_DATE_KEY, today);
+    await globalState.update(SESSION_COUNT_KEY, sessionCount);
+
+    if (sessionCount < SESSION_COUNT_THRESHOLD || (candidatedVersion !== "remindmelater" && Math.random() > PROBABILITY)) {
+      return;
+    }
+
+    const take = {
+      title: "Take Survey",
+      run: async () => {
+        Logger.traceUserData("nsat.survey/takeShortSurvey");
+        commands.executeCommand(
+            "vscode.open",
+            Uri.parse(`${NSAT_SURVEY_URL}?o=${
+                encodeURIComponent(process.platform)}&v=${
+                encodeURIComponent(extensionVersion)}`));
+        await globalState.update(CANDIDATED_VERSION_KEY, extensionVersion);
+        await globalState.update(TAKE_SURVEY_DATE_KEY, today);
+        await globalState.update(SESSION_COUNT_KEY, 0);
+      },
+    };
+    const remind = {
+      title: "Remind Me Later",
+      run: async () => {
+        Logger.traceUserData("nsat.survey/remindMeLater");
+        await globalState.update(CANDIDATED_VERSION_KEY, "remindmelater");
+        await globalState.update(SESSION_COUNT_KEY, 0);
+      },
+    };
+    const never = {
+      title: "Don't Show Again",
+      run: async () => {
+        Logger.traceUserData("nsat.survey/dontShowAgain");
+        await globalState.update(CANDIDATED_VERSION_KEY, "*");
+      },
+    };
+    Logger.traceUserData("nsat.survey/userAsked");
+    const button = await window.showInformationMessage(
+        "Do you mind taking a quick feedback survey about the Arduino Extension for VS Code?",
+        take, remind, never);
+    await (button || remind).run();
+  }
+}