Fixed webpack build failed

Webpack build was failed because of webpack-contrib/css-loader#145

Author: pashamesh

package.json

@@ -32,7 +32,7 @@
     "babel-loader": "^5.3.2",
     "clean-webpack-plugin": "^0.1.3",
     "compass-mixins": "^0.12.7",
-    "css-loader": "^0.19.0",
+    "css-loader": "^0.18.0",
     "eslint": "^1.5.1",
     "eslint-loader": "^1.0.0",
     "expose-loader": "^0.7.0",