D5 engine demo

D5 engine is a one-man-made engine

Use the following libraries:
Graphics: OpenGL
Physic: Bullet

Updates
1.0.4
Lot of change to the engine, including
- real time lighting (no shadow)
- real time shader editor
- component based player and "AI"
- orientation sensor access
- fix various bugs and problem

There is still a Application lifetime management problem, and the app will crash if restarted.

1.0.2
- Fix support for tablet
- Fix text reloading on graphic context lost

1.0.1
- Fix icon Alpha channel for the Google Play
- Debug menu have the same size on different screen size/resolution

1.0
Initial version