Add a Navigation Drawer to the OBA Android app

I find the Navigation Drawer UI Pattern much more convenient than having everything "stuffed" in one menu.
For your viewing pleasure please see attached screenshot. Code should be indented according to the style file. ![drawer](https://cloud.githubusercontent.com/assets/3662452/2986954/4a2fb250-dc49-11e3-82c8-2d3e2bd84d38.png)