[WIP] Upgrade to Webpack 2

postcss.config.js

@@ -0,0 +1,10 @@
+const webpack = require('webpack');
+
+module.exports = {
+  plugins: [
+    require('postcss-import')({ addDependencyTo: webpack }),
+    require('postcss-cssnext')({
+      browsers: ['last 2 versions', 'IE > 10'],
+    }),
+  ],
+};