fix(app): create new $scope for controller tests

Creating new $scope for controller tests both is good practice and
prevents the grunt task failing on a clean install due to jshint
warnings.

templates/javascript/spec/controller.js

@@ -1,6 +1,7 @@
 'use strict';
 
 describe('Controller: <%= classedName %>Ctrl', function () {
+  var scope;
 
   // load the controller's module
   beforeEach(module('<%= scriptAppName %>'));
@@ -9,7 +10,9 @@ describe('Controller: <%= classedName %>Ctrl', function () {
 
   // Initialize the controller and a mock scope
   beforeEach(inject(function ($controller, $rootScope) {
+    scope = $rootScope.$new();
     <%= classedName %>Ctrl = $controller('<%= classedName %>Ctrl', {
+      $scope: scope
       // place here mocked dependencies
     });
   }));