Merge pull request #542 from xinsight/fix-jshint-error

backbone: fixed jshint warnings

architecture-examples/backbone/js/views/app.js

-/*global Backbone, _, $, ENTER_KEY, */
-/*jshint unused:false */
+/*global Backbone, jQuery, _, ENTER_KEY */
 var app = app || {};
 
 (function ($) {

architecture-examples/backbone/js/views/todos.js

-/*global Backbone _ $ ENTER_KEY */
+/*global Backbone, jQuery, _, ENTER_KEY */
 var app = app || {};
 
 (function ($) {