Fixed: fixed a bug of cc.LabelTTF that its setColor is invalid when enable cascade color
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform
Fixed: fixed a bug of cc.LabelTTF that its opacity is incorrect in Canvas render mode.
Merge pull request #2546 from dingpinglv/setTransform

Fixed: fixed a bug of cc.LabelTTF that its setColor is invalid when enable cascade color