Change webpack to use github master branch

package.json

@@ -43,7 +43,7 @@
     "sass-loader": "3.2.0",
     "style-loader": "0.13.0",
     "url-loader": "0.5.7",
-    "webpack": "^1.12.15"
+    "webpack": "webpack/webpack#master"
   },
   "scripts": {
     "check": "eslint --ext \".jsx\" --ignore-pattern node_modules --quiet .",