refactor(aio): cleanup polyfill imports and realign them with the latest cli blueprint

This shouldn't change anything. But it's interesting that we used to have this  import
that seemed bogus, but there were no compilation or rutime errors.

aio/src/main.ts

@@ -1,10 +1,8 @@
-import 'core-js/es7/reflect';
-import 'zone.js/dist/zone';
-
-import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';
-import { environment } from './environments/environment';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
 import { AppModule } from './app/app.module';
+import { environment } from './environments/environment';
 
 if (environment.production) {
   enableProdMode();

aio/src/polyfills.ts

@@ -1,7 +1,24 @@
+/**
+ * This file includes polyfills needed by Angular and is loaded before the app.
+ * You can add your own extra polyfills to this file.
+ *
+ * This file is divided into 2 sections:
+ *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
+ *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
+ *      file.
+ *
+ * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
+ * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
+ * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
+ *
+ * Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html
+ */
 
+/***************************************************************************************************
+ * BROWSER POLYFILLS
+ */
 
-// This file includes polyfills needed by Angular and is loaded before the app.
+/** IE9, IE10 and IE11 requires all of the following polyfills. **/
-// You can add your own extra polyfills to this file.
 // import 'core-js/es6/symbol';
 // import 'core-js/es6/object';
 // import 'core-js/es6/function';
@@ -15,24 +32,37 @@
 // import 'core-js/es6/regexp';
 // import 'core-js/es6/map';
 // import 'core-js/es6/set';
-import 'reflect-metadata';
+
+/** IE10 and IE11 requires the following for NgClass support on SVG elements */
+// import 'classlist.js';  // Run `npm install --save classlist.js`.
+
+/** IE10 and IE11 requires the following to support `@angular/animation`. */
+// import 'web-animations-js';  // Run `npm install --save web-animations-js`.
 
 
-// If you need to support the browsers/features below, uncomment the import
+/** Evergreen browsers require these. **/
-// and run `npm install import-name-here';
+import 'core-js/es6/reflect';
-// Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html
+import 'core-js/es7/reflect';
 
-// Needed for: IE9
-// import 'classlist.js';
 
-// Animations
+/** ALL Firefox browsers require the following to support `@angular/animation`. **/
-// Needed for: All but Chrome and Firefox, Not supported in IE9
+// import 'web-animations-js';  // Run `npm install --save web-animations-js`.
-// import 'web-animations-js';
 
-// Date, currency, decimal and percent pipes
-// Needed for: All but Chrome, Firefox, Edge, IE11 and Safari 10
-// import 'intl';
 
-// NgClass on SVG elements
+
-// Needed for: IE10, IE11
+/***************************************************************************************************
-// import 'classlist.js';
+ * Zone JS is required by Angular itself.
+ */
+import 'zone.js/dist/zone';  // Included with Angular CLI.
+
+
+
+/***************************************************************************************************
+ * APPLICATION IMPORTS
+ */
+
+/**
+ * Date, currency, decimal and percent pipes.
+ * Needed for: All but Chrome, Firefox, Edge, IE11 and Safari 10
+ */
+// import 'intl';  // Run `npm install --save intl`.

aio/src/test.ts

@@ -1,6 +1,5 @@
 // This file is required by karma.conf.js and loads recursively all the .spec and framework files
 
-import 'zone.js/dist/zone';
 import 'zone.js/dist/long-stack-trace-zone';
 import 'zone.js/dist/proxy.js';
 import 'zone.js/dist/sync-test';