fixes #18716 - make storybook work with scss

.storybook/webpack.config.js

@@ -0,0 +1,24 @@
+var ExtractTextPlugin = require('extract-text-webpack-plugin');
+module.exports = {
+  module: {
+    loaders: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        loader: 'babel-loader'
+      },
+      {
+        test: /\.css$/,
+        loader: 'style-loader!css-loader'
+      },
+      {
+        test: /(\.png|\.gif)$/,
+        loader: 'url-loader?limit=32767'
+      },
+      {
+        test: /\.scss$/,
+        loader: 'style-loader!css-loader?sourceMap!sass-loader?sourceMap'
+      }
+    ]
+  }
+};