Merge pull request mseemann#798 from mseemann/greenkeeper-webpack-2.4.0

Update webpack to version 2.4.0 🚀

Author: mseemann

package.json

@@ -86,7 +86,7 @@
     "typescript": "2.2.2",
     "typings": "2.1.1",
     "web-animations-js": "2.2.3",
-    "webpack": "2.3.3",
+    "webpack": "2.4.0",
     "webpack-dev-server": "2.4.2",
     "webpack-merge": "4.1.0",
     "zone.js": "0.8.5"