Dependency updates (#581)

no issue
* ember-data@2.12.0
* autoprefixer@6.7.7
* ember-cli-mirage@0.2.8
* ember-cli-app-version@2.0.2
* ember-resolver@3.0.0
* grunt-shell@2.1.0
* bump yarn.lock sub-dependencies

package.json

@@ -26,7 +26,7 @@
     "node": "~0.12.0 || ^4.2.0"
   },
   "devDependencies": {
-    "autoprefixer": "6.7.6",
+    "autoprefixer": "6.7.7",
     "blueimp-md5": "2.7.0",
     "bower": "1.8.0",
     "broccoli-asset-rev": "2.5.0",
@@ -43,7 +43,7 @@
     "ember-ajax": "2.5.6",
     "ember-cli": "2.11.1",
     "ember-cli-active-link-wrapper": "0.3.2",
-    "ember-cli-app-version": "2.0.1",
+    "ember-cli-app-version": "2.0.2",
     "ember-cli-babel": "5.2.4",
     "ember-cli-chai": "0.3.2",
     "ember-cli-code-coverage": "0.3.11",
@@ -53,7 +53,7 @@
     "ember-cli-fastclick": "1.3.0",
     "ember-cli-htmlbars": "1.1.1",
     "ember-cli-htmlbars-inline-precompile": "0.3.6",
-    "ember-cli-mirage": "0.2.6",
+    "ember-cli-mirage": "0.2.8",
     "ember-cli-mocha": "0.13.2",
     "ember-cli-node-assets": "0.1.6",
     "ember-cli-postcss": "3.1.2",
@@ -65,7 +65,7 @@
     "ember-cli-uglify": "1.2.0",
     "ember-composable-helpers": "2.0.0",
     "ember-concurrency": "0.7.19",
-    "ember-data": "2.11.3",
+    "ember-data": "2.12.0",
     "ember-data-filter": "1.13.0",
     "ember-export-application-global": "1.1.1",
     "ember-infinity": "0.2.8",
@@ -76,7 +76,7 @@
     "ember-load-initializers": "0.6.3",
     "ember-one-way-controls": "2.0.0",
     "ember-power-select": "1.5.0",
-    "ember-resolver": "2.1.1",
+    "ember-resolver": "3.0.0",
     "ember-route-action-helper": "2.0.2",
     "ember-simple-auth": "1.2.0",
     "ember-sinon": "0.6.0",
@@ -91,7 +91,7 @@
     "glob": "7.1.1",
     "grunt": "1.0.1",
     "grunt-bg-shell": "2.3.3",
-    "grunt-shell": "1.3.1",
+    "grunt-shell": "2.1.0",
     "jquery-deparam": "0.5.3",
     "liquid-fire": "0.27.1",
     "liquid-wormhole": "2.0.4",