Fixed #1339: always go through glBindTexture2D to ensure consistent cache
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss3411_HideRectorigin
Merge pull request #1344 from dingpinglv/Iss1339_glBindTexture2D

Fixed #1339:always go through glBindTexture2D to ensure consistent cache