New Home Screen

This adds a hew home screen. It incorporates the sections that were added in the last couple of pulls as well as shows the last couple of games you've most recently played.

It's not real pretty yet, but it'll get there.

## More Details

These new sections were added:

* Platforms - Browse games by their game console
* Collections - Showing what we actually did in #7 
* Favorites - Showing what we actually did in #8 

In addition to all of this, the nav stack was also leveled up, in that we have one now. Instead of just reloading controllers whenever we need to get to them, the history is tracked so we just show them. This doesn't just mean its more legit, it means the currently selected item of the previous view is retained :metal:

![screen shot 2014-08-02 at 10 59 36 pm](https://cloud.githubusercontent.com/assets/260/3789718/be25acae-1abb-11e4-88cd-bc0708531d32.png)