Revert: Update webpack@2

Author: azu

package.json

@@ -27,7 +27,7 @@
     "raw-loader": "^0.5.1",
     "style-loader": "^0.13.0",
     "url-loader": "^0.5.7",
-    "webpack": "^2.1.0-beta.4"
+    "webpack": "^1.12.14"
   },
   "dependencies": {
     "acorn": "^3.0.4",