customize babel-loader behavior -- don't try to cache babel macros

lib/pipeline/webpack.config.js

@@ -103,6 +103,7 @@ const base = {
         exclude: /(node_modules|bower_components|\.embark[\\/]versions)/,
         options: {
           cacheDirectory: true,
+          customize: path.join(__dirname, 'webpack-overrides.js'),
           plugins: [
             [
               'babel-plugin-module-resolver', {