Resolve dependency module requiring

* es5 style module exports
* remove script tag require
* webpack config ProvidePlugin

Note that this commit only fix JavaScript module loading runtime error.

public/js/render.js

@@ -50,4 +50,8 @@ var filterXSSOptions = {
 
 function preventXSS(html) {
     return filterXSS(html, filterXSSOptions);
-}
+}
+
+module.exports = {
+  preventXSS: preventXSS
+}