JSHint headless-ember

- Mark all exported vars
- Mark redefined global vars
- Suppress leak warning for the redefinition of jQuery

.jshintignore

@@ -1,5 +1,4 @@
 app/assets/javascripts/defer/html-sanitizer-bundle.js
-lib/headless-ember.js
 lib/javascripts/locale/
 lib/javascripts/messageformat.js
 lib/javascripts/moment.js

lib/headless-ember.js

@@ -1,3 +1,5 @@
+/*global Element:true, document:true, window:true, $:true, jQuery:true */
+/*exported precompileEmberHandlebars, $, jQuery */
 // DOM
 var Element = {};
 Element.firstChild = function () { return Element; };
@@ -11,8 +13,10 @@ this.document = document;
 var console = window.console = {};
 console.log = console.info = console.warn = console.error = function(){};
 
+/*jshint -W120 */
 // jQuery
 var $ = jQuery = window.jQuery = function() { return jQuery; };
+/*jshint +W120*/
 jQuery.ready = function() { return jQuery; };
 jQuery.inArray = function() { return jQuery; };
 jQuery.event = {