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)

every `ImageView` should always have a `contentdescription` this is so partially sighted people & screenreaders can also use your application. `contentdecsription` is alwaysa  must for any imageview, (it is like the `defaiult` case on a switch statement) If you have reason that it should not contain anything for a screenreader to read i.e. imagine an imageview that is a shadow or background then you can use `@null`