SneakInput cocos2d-x v2.1

supoort cocos2d-x v2.1 version,i will keeping update the project.
update 2013-04-11-am

added SneakyInputEx.h and .cpp file,update SneakButtonSkinnedBase.h
SneakyJoystickSkinnedBase.h file
Revert "update 2013-04-11-am"

This reverts commit e925d9393558608d4596563a39f5929563b22861.
Revert "Revert "update 2013-04-11-am""

This reverts commit 242e6a990b0a9cd9384af94f8c56f61f348958c3.