Cocos2dx Tizen support.

I want to volunteer to implement Tizen support.

Done
 * cocos2dx
 * CocosDenshion
 * extensions
 * external/Box2D
 * external/Chipmunk
 * samples/Cpp/HelloCpp
 * samples/Cpp/SampleGame
 * samples/Cpp/TestCpp

ToDo
 * Accelerometer

Thanks.