Merge pull request #1777 from dingpinglv/master

Closed #4768: update the reference of samples and README.mdown
Fixed #4866: Fixed a bug of cc.Scale9Sprite that its CascadeColor and CascadeOpacity are invalid.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-html5 into Iss4866_Scale9Sprite2x
Merge pull request #1782 from dingpinglv/Iss4866_Scale9Sprite2x

Fixed #4866: Fixed a bug of cc.Scale9Sprite that its CascadeColor and CascadeOpacity are invalid.