Merge pull request #3 from vinceyuan/master

Added the missing cocos2dx-Prefix.pch to make the project compile.
fix bug
Merge branch 'master' of github.com:crosslife/OpenBird
fix bird flap bug
android:screenOrientation
sounds add & bug fix
better control
better rotate
add latest apk
update gif
better rotate
Update README.md
best score & medal
android pro
Update gif
Update apk