Fixed #1669 fixed cc.DrawNode bug for drawPoly and borderWidth
Merge branch 'master' of https://github.com/cocos2d/cocos2d-html5 into Iss1669_DrawNodeBug
Merge pull request #741 from dingpinglv/Iss1669_DrawNodeBug

Fixed #1669 fixed cc.DrawNode bug for drawPoly and borderWidth