Updating client dependancies (#4083)

webapp/webpack.config.js

@@ -84,9 +84,6 @@ var config = {
             }
         ]
     },
-    sassLoader: {
-        includePaths: ['node_modules/compass-mixins/lib']
-    },
     plugins: [
         new webpack.ProvidePlugin({
             'window.jQuery': 'jquery'
@@ -102,6 +99,13 @@ var config = {
             minimize: !DEV,
             debug: false
         }),
+        new webpack.LoaderOptionsPlugin({
+            options: {
+                sassLoader: {
+                    includePaths: ['node_modules/compass-mixins/lib']
+                }
+            }
+        }),
         new webpack.DefinePlugin({
             'process.env': {
                 NODE_ENV: JSON.stringify('production')