Fixed #5803: UIBMFont supports async loading resource.
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5803_Widget

Conflicts:
	CCBoot.js
Merge pull request #2086 from dingpinglv/Iss5803_Widget

Fixed #5803: UIBMFont supports async loading resource.