feat(NavView): support ControllerAs syntax for ion-nav-views

Closes #3058. Closes #2499. Cloese #3651
This adds support for setting up controllers like this

.state('app', {
  url: '/app',
  abstract: true,
  templateUrl: 'templates/menu.html',
  controller: 'AppCtrl',
  controllerAs: 'main'
})

Author: urish

Diff for: js/angular/controller/navViewController.js

@@ -267,6 +267,9 @@ function($scope, $element, $attrs, $compile, $controller, $ionicNavBarDelegate,
     if (viewLocals && viewLocals.$$controller) {
       viewLocals.$scope = viewScope;
       var controller = $controller(viewLocals.$$controller, viewLocals);
+      if (viewLocals.$$controllerAs) {
+        viewScope[viewLocals.$$controllerAs] = controller;
+      }
       $element.children().data('$ngControllerController', controller);
     }
 

Diff for: test/unit/angular/controller/navViewController.unit.js

@@ -81,5 +81,26 @@ describe('$ionicNavView controller', function() {
     expect(navBarCtrl.title()).toBe('My title');
   }));
 
+  it('should support controllerAs syntax', inject(function($rootScope, $compile) {
+    var containerEle = angular.element('<div>');
+    var navBarEle = angular.element('<ion-nav-bar>');
+    var navViewEle = angular.element('<ion-nav-view>');
+    var innerElement = angular.element('<content>');
+
+    containerEle.append(navBarEle);
+    navBarEle.append(navViewEle);
+
+    $compile(containerEle)($rootScope);
+
+    var navViewCtrl = navViewEle.data('$ionNavViewController');
+    var navViewScope = navViewEle.scope();
+
+    var ViewCtrlConstructor = jasmine.createSpy('ViewCtrlConstructor');
+    navViewCtrl.appendViewElement(innerElement, {$$controller: ViewCtrlConstructor, $$controllerAs: 'vm'});
+
+    var innerScope = innerElement.scope();
+    expect(ViewCtrlConstructor).toHaveBeenCalled();
+    expect(innerScope.vm instanceof ViewCtrlConstructor).toBeTruthy();
+  }));
 
 });