fix error for load spriteFrames from plist in CCAnimationCache class.
add comments about what does plist parameter mean.
Merge branch 'master' of git://github.com/cocos2d/cocos2d-x
fix compiling error on android.
Merge pull request #4824 from Dhilan007/master_222

fix error for load spriteFrames from plist in CCAnimationCache class.