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)

:+1: don't know if on purpose or not, but always consider the power of `private static` methods http://stackoverflow.com/questions/11240178/what-is-the-gain-from-declaring-a-method-as-static