Test renderTexture setColor function
Fixed a bug of cc.Sprite.setColor that it doesn't work when its originalTexture is Canvas element
Remove the Test codes.
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5832_RenderTexture
Merge pull request #2153 from dingpinglv/Iss5832_RenderTexture

Fixed a bug of cc.Sprite.setColor that it doesn't work when its originalTexture is Canvas element