Adds es2015, stage-2 support.

Author: tralves

.babelrc

@@ -7,8 +7,5 @@
       }
     ],
     "stage-2"
-  ],
-  "plugins": [
-    "external-helpers"
   ]
 }

package.json

@@ -13,27 +13,31 @@
     "vue-router": "^2.4.0"
   },
   "devDependencies": {
-    "babel-traverse": "6.24.1",
-    "babel-types": "6.24.1",
-    "babylon": "6.16.1",
-    "copy-webpack-plugin": "~4.0.1",
-    "css-loader": "^0.28.4",
-    "extract-text-webpack-plugin": "~2.1.0",
-    "lazy": "1.0.11",
-    "merge-files-webpack-plugin": "^1.1.2",
-    "nativescript-css-loader": "~0.26.0",
-    "nativescript-dev-android-snapshot": "^0.*.*",
-    "nativescript-dev-webpack": "^0.6.3",
-    "node-sass": "^4.5.3",
-    "raw-loader": "~0.5.1",
-    "resolve-url-loader": "~2.0.2",
-    "sass-loader": "^6.0.6",
-    "style-loader": "^0.18.2",
-    "vue-loader": "^12.2.1",
-    "vue-style-loader": "^3.0.1",
-    "vue-template-compiler": "2.5.2",
-    "webpack": "~2.6.1",
-    "webpack-sources": "~1.0.1"
+  "babel-core": "^6.26.0",
+  "babel-loader": "^7.1.2",
+  "babel-preset-es2015": "^6.24.1",
+  "babel-preset-stage-2": "^6.24.1",
+  "babel-traverse": "6.24.1",
+  "babel-types": "6.24.1",
+  "babylon": "6.16.1",
+  "copy-webpack-plugin": "~4.0.1",
+  "css-loader": "^0.28.4",
+  "extract-text-webpack-plugin": "~2.1.0",
+  "lazy": "1.0.11",
+  "merge-files-webpack-plugin": "^1.1.2",
+  "nativescript-css-loader": "~0.26.0",
+  "nativescript-dev-android-snapshot": "^0.*.*",
+  "nativescript-dev-webpack": "^0.6.3",
+  "node-sass": "^4.5.3",
+  "raw-loader": "~0.5.1",
+  "resolve-url-loader": "~2.0.2",
+  "sass-loader": "^6.0.6",
+  "style-loader": "^0.18.2",
+  "vue-loader": "^12.2.1",
+  "vue-style-loader": "^3.0.1",
+  "vue-template-compiler": "2.5.2",
+  "webpack": "~2.6.1",
+  "webpack-sources": "~1.0.1"
   },
   "scripts": {
     "ns-bundle": "ns-bundle",