Add 'Shaping up with Angular.js' links

# What's included?

This PR adds, as requested, links to [Shaping up with Angular.js](http://angular.codeschool.com/), the course created by [Code School](http://www.codeschool.com/), and sponsored by **Google**. The link is added in two spots, which are shown below.

## Main Link

![angularjs superheroic javascript mvw framework 2014-05-22 13-10-36 2014-05-22 13-10-37](https://cloud.githubusercontent.com/assets/30208/3061194/b1e55792-e202-11e3-9cf5-707a90ed214c.png)

## Navigation Link

![angularjs superheroic javascript mvw framework 2014-05-22 18-42-00 2014-05-22 18-42-03](https://cloud.githubusercontent.com/assets/30208/3061199/c414ad0a-e202-11e3-8fe3-de43ac58a58b.png)

Let us know if you need any adjustments made!