chore(*): switch URLs from npmcdn.com to unpkg.com

The domain changed, the old one redirects to the new one.

docs/content/guide/component-router.ngdoc

@@ -150,7 +150,7 @@ You can see the complete application running below.
     <app></app>
 
     <!-- Load up the router library - normally you might use npm and host it locally -->
-    <script src="https://npmcdn.com/@angular/[email protected]/angular1/angular_1_router.js"></script>
+    <script src="https://unpkg.com/@angular/[email protected]/angular1/angular_1_router.js"></script>
   </file>
 
   <file name="app.js">
@@ -493,7 +493,7 @@ You also need to include ES6 shims for browsers that do not support ES6 code (In
  <!-- IE required polyfills, in this exact order -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/es6-shim/0.33.3/es6-shim.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.20/system-polyfills.js"></script>
- <script src="https://npmcdn.com/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
+ <script src="https://unpkg.com/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
  ```
 
 ## Create the `app` module

src/ngComponentRouter/Router.js

@@ -26,7 +26,7 @@
  *  <!-- IE required polyfills, in this exact order -->
  *  <script src="https://cdnjs.cloudflare.com/ajax/libs/es6-shim/0.33.3/es6-shim.min.js"></script>
  *  <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.20/system-polyfills.js"></script>
- *  <script src="https://npmcdn.com/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
+ *  <script src="https://unpkg.com/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
  *  ```
  *
  * Then load the module in your application by adding it as a dependent module: