Merge pull request #2243 from pandamicro/develop

Sync
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
'Attr.ownerElement' is deprecated and has been removed from DOM4
'Attr.ownerElement' is deprecated and has been removed from DOM4
Merge pull request #2245 from VisualSJ/3.0-3

'Attr.ownerElement' is deprecated and has been removed from DOM4
'Attr.ownerElement' is deprecated and has been removed from DOM4
Merge pull request #2246 from VisualSJ/3.0-3

'Attr.ownerElement' is deprecated and has been removed from DOM4
Null does not support toString
Merge pull request #2247 from VisualSJ/3.0-3

Null does not support toString
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
Fixed a bug of cc.LabelBMFont
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #2248 from dingpinglv/develop

Fixed a bug of cc.LabelBMFont
Issue #5907: Fix API reference issues
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop