fix(polyfills): move polyfills to scripts array

Polyfills found in polyfills.ts would not be available for scripts due to being loaded in the main bundle only.

Fix angular#2752
Fix angular#3309

Author: filipesilva

packages/angular-cli/blueprints/ng2/files/__path__/main.ts

@@ -1,5 +1,3 @@
-import './polyfills.ts';
-
 import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';
 import { environment } from './environments/environment';

packages/angular-cli/blueprints/ng2/files/__path__/polyfills.ts

@@ -20,7 +20,10 @@
       "styles": [
         "styles.<%= styleExt %>"
       ],
-      "scripts": [],
+      "scripts": [
+        "<%= relativeRootPath %>/node_modules/core-js/client/shim.min.js",
+        "<%= relativeRootPath %>/node_modules/zone.js/dist/zone.js"
+      ],
       "environments": {
         "source": "environments/environment.ts",
         "dev": "environments/environment.ts",