fix(lint): Updated the main.ts's blueprint to fix the ng lint failure (angular#1903) (angular#1904)

Author: ramsrib

addon/ng2/blueprints/ng2/files/__path__/main.ts

@@ -1,4 +1,4 @@
-import "./polyfills.ts";
+import './polyfills.ts';
 
 import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';