new structure; code polish

crawler/webpack.config.js

@@ -4,17 +4,14 @@ module.exports = {
 
   output: {
     path: __dirname + "/build",
-    filename: "crawler.js",
-    devtool: 'source-map'
+    filename: "crawler.js"
   },
   module: {
 
     loaders: [{
       test: /.js?$/,
       loader: 'babel-loader',
-      exclude: /node_modules/,
-      presets: ['es2015'],
-      plugins: ['transform-async-to-generator']
+      exclude: /node_modules/
     }, {
       test: /.json?$/,
       loader: 'json-loader',