Favorites

This adds the ability to add to a running list of Favorite games.

## Toggling favorites

Just roll over the game and click the :heart: to toggle it as a Favorite.

![fav](https://cloud.githubusercontent.com/assets/260/3555015/90754202-0912-11e4-8913-b2d00a0ccebf.gif)

## Caveats

Favorites are not browsable yet. We need to create the new home screen before that's possible. I just want get this in there first before we go and change a TON of other stuff.