Merge pull request #939 from mozilla/greenkeeper-webpack-1.13.2

Update webpack to version 1.13.2 🚀

Author: muffinresearch

package.json

@@ -230,7 +230,7 @@
     "supertest": "1.2.0",
     "supertest-as-promised": "4.0.0",
     "svg-url-loader": "1.1.0",
-    "webpack": "1.13.1",
+    "webpack": "1.13.2",
     "webpack-dev-middleware": "1.6.1",
     "webpack-dev-server": "1.14.1",
     "webpack-hot-middleware": "2.12.2",