Use __dirname instead of module.filename to support bundlers better.

Author: gisenberg

lib/ui.js

@@ -5,7 +5,7 @@ const fileStore = { };
 const fs = require('fs');
 const path = require('path');
 const _ = require('./utils.js');
-const includesDir = path.join(path.dirname(module.filename), '../ui');
+const includesDir = path.join(__dirname, '../ui');
 
 const readFile = (name, callback) => {
   if (fileStore[name]) {