Use webpack to build

src/main/menus/tray.js

@@ -0,0 +1,20 @@
+'use strict';
+
+const electron = require('electron');
+const Menu = electron.Menu;
+const MenuItem = electron.MenuItem;
+
+var createDefault = function() {
+  var menu = new Menu();
+  menu.append(new MenuItem({
+    label: 'Quit',
+    click: function(item) {
+      require('app').quit();
+    }
+  }));
+  return menu;
+}
+
+module.exports = {
+  createDefault: createDefault
+};