Merge pull request #2083 from dingpinglv/Iss5803_Widget

Fixed #5803: Set the default value of ccui.Widget's _cascadeColorEnabled and _cascadeOpacityEnabled to false
CCBoot.js prepare function (cc.error is not define)
Merge pull request #2084 from VisualSJ/develop-rc2

CCBoot.js prepare function (cc.error is not define)
Fixed #5803: UIBMFont supports async loading resource.
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5803_Widget

Conflicts:
	CCBoot.js