Use built-in url parsing in preload script

Latest electron allows acces to the url module in a preload script.
Also add a wrapper to shield global scope and use strict inside.

// FREEBIE

preload.js

@@ -1,15 +1,11 @@
-/*
+(function () {
- * Pending electron 1.6.x
+  'use strict';
- * const env = require('url').parse(window.location, true).query;
+  console.log('preload');
-*/
+  const electron = require('electron')
 
-console.log('preload');
+  window.config = require('url').parse(window.location.toString(), true).query;
 
-window.config = {};
+  const ipc = electron.ipcRenderer
-window.location.search.substring(1).split('&').forEach(function(variable) {
+  window.config.locale_json = ipc.sendSync('locale-data');
-  var pair = variable.split('=');
-  config[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
-});
 
-const ipc = require('electron').ipcRenderer
+})();
-window.config.locale_json = ipc.sendSync('locale-data');