diff --git a/package-lock.json b/package-lock.json
index 98d642c..a452d62 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
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+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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-      "engines": {
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+        "sprintf-js": "~1.0.2"
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@@ -551,6 +542,22 @@
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+      "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
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+      "engines": {
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-      "integrity": "sha1-D8GqoIig4+8Ovi2IMbqw3PiEUGE=",
-      "engines": {
-        "node": "*"
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+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.4.tgz",
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@@ -926,19 +930,6 @@
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@@ -956,9 +947,9 @@
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-      "resolved": "https://registry.npmjs.org/colors/-/colors-0.6.2.tgz",
-      "integrity": "sha1-JCP+ZnisDF2uiFLl0OW+CMmXq8w=",
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@@ -1066,9 +1057,9 @@
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-      "integrity": "sha1-sCIMAt6YYXQztyhRz0fePfLNvuk=",
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@@ -1152,6 +1143,14 @@
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@@ -1248,15 +1233,15 @@
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-      "integrity": "sha1-n1V+CPw7TSbs6d00+Pv0drYlha0=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
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       "bin": {
         "esparse": "bin/esparse.js",
         "esvalidate": "bin/esvalidate.js"
       },
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-        "node": ">=0.4.0"
+        "node": ">=4"
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@@ -1267,7 +1252,7 @@
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@@ -1280,6 +1265,22 @@
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+      "resolved": "https://registry.npmjs.org/expand-tilde/-/expand-tilde-2.0.2.tgz",
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+      "dependencies": {
+        "homedir-polyfill": "^1.0.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
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+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
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+    },
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@@ -1413,6 +1414,29 @@
         "node": "*"
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/fined/-/fined-1.2.0.tgz",
+      "integrity": "sha512-ZYDqPLGxDkDhDZBjZBb+oD1+j0rA4E0pXY50eplAAOPg2N/gUBSSk5IM1/QhPfyVo19lJ+CvXpqfvk+b2p/8Ng==",
+      "dependencies": {
+        "expand-tilde": "^2.0.2",
+        "is-plain-object": "^2.0.3",
+        "object.defaults": "^1.1.0",
+        "object.pick": "^1.2.0",
+        "parse-filepath": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/flagged-respawn": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/flagged-respawn/-/flagged-respawn-1.0.1.tgz",
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+      }
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@@ -1421,6 +1445,25 @@
         "flat": "cli.js"
       }
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+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
+      "integrity": "sha512-7EwmXrOjyL+ChxMhmG5lnW9MPt1aIeZEwKhQzoBUdTV0N3zuwWDZYVJatDvZ2OyzPUvdIAZDsCetk3coyMfcnQ==",
+      "engines": {
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+    "node_modules/for-own": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/for-own/-/for-own-1.0.0.tgz",
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+      "dependencies": {
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+      },
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@@ -1488,6 +1531,11 @@
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@@ -1549,11 +1597,11 @@
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+      "resolved": "https://registry.npmjs.org/getobject/-/getobject-1.0.2.tgz",
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+        "node": ">=10"
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@@ -1585,6 +1633,45 @@
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       "integrity": "sha1-ykMJ2t7mtUzAuNJH6NfHoJdb3Js="
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+        "is-windows": "^1.0.1",
+        "resolve-dir": "^1.0.0"
+      },
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+        "node": ">=0.10.0"
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+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/global-prefix/-/global-prefix-1.0.2.tgz",
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+        "homedir-polyfill": "^1.0.1",
+        "ini": "^1.3.4",
+        "is-windows": "^1.0.1",
+        "which": "^1.2.14"
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+        "node": ">=0.10.0"
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+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
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@@ -1654,33 +1741,31 @@
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-        "coffee-script": "~1.3.3",
-        "colors": "~0.6.2",
-        "dateformat": "1.0.2-1.2.3",
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-        "underscore.string": "~2.2.1",
-        "which": "~1.0.5"
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+        "iconv-lite": "~0.4.13",
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+        "minimatch": "~3.0.4",
+        "mkdirp": "~1.0.4",
+        "nopt": "~3.0.6",
+        "rimraf": "~3.0.2"
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+      "bin": {
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+        "node": ">=8"
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     "node_modules/grunt-clear": {
@@ -1697,6 +1782,36 @@
         "grunt": "~0.4.1"
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+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/grunt-cli/-/grunt-cli-1.4.3.tgz",
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+        "interpret": "~1.1.0",
+        "liftup": "~3.0.1",
+        "nopt": "~4.0.1",
+        "v8flags": "~3.2.0"
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+      "bin": {
+        "grunt": "bin/grunt"
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+      "engines": {
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+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/nopt/-/nopt-4.0.3.tgz",
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+      "dependencies": {
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+        "osenv": "^0.1.4"
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@@ -1728,83 +1843,95 @@
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-known-options/-/grunt-known-options-2.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/resolve-dir/-/resolve-dir-1.0.1.tgz",
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-      "integrity": "sha1-5Dm+Kq7jJzIZUnMPmaiSnk/FBYI="
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+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
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+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
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+            "minimatch": "^3.1.1",
+            "once": "^1.3.0",
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+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
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+    "safer-buffer": {
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+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
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@@ -6671,6 +7540,11 @@
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+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
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       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
@@ -6726,6 +7600,11 @@
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+    "supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
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+    },
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@@ -6812,37 +7691,6 @@
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       "requires": {
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-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "^3.0.4",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
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-        "minimatch": {
-          "version": "3.1.2",
-          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-          "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-          "requires": {
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-        "rimraf": {
-          "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
-          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
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@@ -6892,15 +7740,26 @@
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-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.7.0.tgz",
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+    "unc-path-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha512-eXL4nmJT7oCpkZsHZUOJo8hcX3GbsiDOa0Qu9F646fi8dT3XuSVopVqAcEiVzSKKH7UoDti23wNX3qGFxcW5Qg=="
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     "underscore.string": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-2.2.1.tgz",
-      "integrity": "sha512-3FVmhXqelrj6gfgp3Bn6tOavJvW0dNH2T+heTD38JRxIrAbiuzbqjknszoOYj3DyFB1nWiLj208Qt2no/L4cIA=="
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+      "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
+      "requires": {
+        "sprintf-js": "^1.1.1",
+        "util-deprecate": "^1.0.2"
+      },
+      "dependencies": {
+        "sprintf-js": {
+          "version": "1.1.2",
+          "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.2.tgz",
+          "integrity": "sha512-VE0SOVEHCk7Qc8ulkWw3ntAzXuqf7S2lvwQaDLRnUeIEaKNQJzV6BwmLKhOqT61aGhfUMrXeaBk+oDGCzvhcug=="
+        }
+      }
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     "universalify": {
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@@ -6912,6 +7771,14 @@
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       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "v8flags": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
+      "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
+      "requires": {
+        "homedir-polyfill": "^1.0.1"
+      }
+    },
     "vargs": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/vargs/-/vargs-0.1.0.tgz",
@@ -7014,11 +7881,6 @@
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@@ -7100,9 +7962,12 @@
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-      "resolved": "https://registry.npmjs.org/which/-/which-1.0.9.tgz",
-      "integrity": "sha1-RgwdoPgQED0DIam2M6+eV15kSG8="
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "requires": {
+        "isexe": "^2.0.0"
+      }
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     "wide-align": {
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diff --git a/package.json b/package.json
index 6f6daed..b472d8a 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "chai": "^1.9.2",
     "chai-as-promised": "^4.1.1",
     "should": "^4.1.0",
-    "grunt": "^0.4.5",
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     "grunt-clear": "^0.2.1",
     "grunt-contrib-watch": "^0.6.1",
     "grunt-mocha-test": "^0.12.2",