Android gui


![screenshot_2014-12-12-06-06-59](https://cloud.githubusercontent.com/assets/9613592/5410437/a19802cc-81c6-11e4-8a22-76ff037fc97d.png)

This PR extends Android GUI by adding buttons for drop, fly, noclip, fast, debug, camera mode and rangeview. Status texts are centered making them more visible.