Improved Quaternion Example

I improved the quaternion example to have a dynamically rotating box (sides can be of any size) instead of just a surface with a rotation applied once.

#### A picture of the example in action:
![screenshot 2014-04-16 17 39 01](https://cloud.githubusercontent.com/assets/2587335/2727040/021c32ae-c5c9-11e3-93e5-5e4999405850.png)

#### The embedded scrollview is purposeful, as shown:
![screenshot 2014-04-16 17 45 07](https://cloud.githubusercontent.com/assets/2587335/2727058/916989ac-c5c9-11e3-853d-4b8e0ee24f0b.png)

### I did not follow the style guide for colors/fonts.