Added the files of cocos2d-x version 2.2

Signed-off-by: shines77 <gz_shines@msn.com>
Update README.md file.

Signed-off-by: shines77 <gz_shines@msn.com>
Update README.md file again.

Signed-off-by: shines77 <gz_shines@msn.com>
Added SetBackgroundMusicVolume() and SetEffectVolume() support for libCocosDenshion on Windows ( use mciSendCommand() ).

Remove some mp3 resource files.

Signed-off-by: shines77 <gz_shines@msn.com>
Some modifications.

Signed-off-by: shines77 <gz_shines@msn.com>
Merge branch 'master' of https://github.com/gamedev2/cocos2d-x-2.2