UI Update: Main Menu and Streams

Updates made to the UI:
- Holo Light theme
- Creates a main menu which allows the user to authenticate and select which stream they would like to view
- Stream views updated to a card layout

![ui_update_menu](https://cloud.githubusercontent.com/assets/3380092/3705645/9023d3da-1421-11e4-98e2-485d8e00b242.png)
![ui_update_stream](https://cloud.githubusercontent.com/assets/3380092/3705646/90299d92-1421-11e4-837d-88cf61a1cfaf.png)

![](http://stream1.gifyo.com/pictures/5/large/fcfa53c0b03240c5098a0a79868ac723-600591613.gif)

unless we're okay with this now @charroch?