Split webpack config into 3 files (base, dev, production).

tools/webpack.dev.config.js

@@ -0,0 +1,16 @@
+var config = require('./webpack.config.js');
+
+config.entry.push('webpack-dev-server/client?http://0.0.0.0:9991/socket.io');
+config.devtool = 'eval';
+config.output.publicPath = 'http://0.0.0.0:9991/webpack/';
+
+config.devServer = {
+    port: 9994,
+    stats: "errors-only",
+    watchOptions: {
+        aggregateTimeout: 300,
+        poll: 1000,
+    },
+};
+
+module.exports = config;