AppState --> Snapshots Migration Sample

![savedgamescreenshot](https://cloud.githubusercontent.com/assets/8466666/4835575/0d55caf6-5fb9-11e4-8e0a-63c3677c2312.png)

Very basic sample app that demonstrates AppState and SavedGames while also showing how to migrate data.  @wolffg @claywilkinson @gguuss please review.

I'm not sure if I should handle conflicts in this sample.  It is important to show developers how to handle them however we have another sample that does it more completely and it would obscure the direct goal of this sample (just show AppState vs Snapshots)