Add support for css modules

Author: bmatto

packages/react-scripts/config/webpack.config.dev.js

@@ -147,9 +147,10 @@ module.exports = function(publicPath) {
       // "style" loader turns CSS into JS modules that inject <style> tags.
       // In production, we use a plugin to extract that CSS to a file, but
       // in development "style" loader enables hot editing of CSS.
+      // ZEAL: Add support for CSS Modules
       {
         test: /\.css$/,
-        loader: 'style!css?importLoaders=1!postcss'
+        loader: 'style!css?importLoaders=1&modules=1!postcss'
       },
       // JSON is not enabled by default in Webpack but both Node and Browserify
       // allow it implicitly so we also enable it.