fixed removeArmatureFileInfo not remove all image file
fixed set blend function
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Merge pull request #6362 from 2youyouo2/master

1) fixed ArmatureDataManager::removeArmatureFileInfo can't remove image from cache
2) fixed a logical error in CCBone:: setBlendFunc