Merge pull request #1704 from dingpinglv/Iss3767_DrawNode

Fixed a bug of Sprite that it doesn't work when its texture doesn't preload and its parent is a SpriteBatchNode
Fixed #192: fixed a bug in CCBoot.js that it has a error on Firefox.
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into Iss3767_DrawNode