adding missing lib

Author: shprink

package.json

@@ -39,6 +39,7 @@
     "gulp": "^3.9.0",
     "gulp-ngdocs": "^0.2.13",
     "ng-annotate-loader": "~0.0.6",
+    "html-webpack-plugin": "^1.5.0",
     "path": "^0.4.9",
     "util": "^0.10.3",
     "webpack": "~1.10.0",