Include jshint "hints" in tests

Author: Amiel Martin

tests/unit/index-nodetest.js

@@ -1,3 +1,5 @@
+/* jslint node: true */
+/* globals describe, before, beforeEach, it */
 'use strict';
 
 var fs     = require('fs');

tests/unit/lib/utilities/extract-index-config-nodetest.js

@@ -1,3 +1,7 @@
+/* jslint node: true */
+/* globals describe, before, it */
+'use strict';
+
 var assert = require('ember-cli/tests/helpers/assert');
 
 var fs = require('fs');