Fixed webpack version

Author: TheLarkInn

package.json

@@ -99,7 +99,7 @@
     "typescript": "^1.9.0-dev.20160627-1.0",
     "typings": "^0.8.1",
     "url-loader": "^0.5.7",
-    "webpack": "2.1.0-beta.16",
+    "webpack": "2.1.0-beta.15",
     "webpack-closure-compiler": "^2.0.2",
     "webpack-dev-server": "^1.14.1",
     "webpack-md5-hash": "0.0.5",