UI overhaul/updating

* Transitioned to Holo Light interface
* New drawables to better match the Holo UI
* Cleaned up some layouts from AOSP
* Overall layout improvements/fixes

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
Remove tests dir

Uneeded

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>