turn webpack middleware into middleware

fix HMR middleware, and some loopback boilerplate cleanup

server/middleware/helpers/webpack.js

@@ -0,0 +1,9 @@
+const webpack = require('webpack');
+const config = require('../../config/webpack.dev');
+
+const compiler = webpack(config);
+
+module.exports = {
+  compiler,
+  config,
+};