Merge pull request #1922 from pandamicro/develop

Fixed #5556: Make FadeIn support only duration as parameter
Temporary removal of assert
Merge pull request #1926 from VisualSJ/develop-123

Temporary removal of assert
fixed: one-loop CCArmatureAnimation can't finish when setSpeedScale is less than 1.0;
fixed: an obvious layout bug;
Merge pull request #1929 from mutoo/develop

fixed some bugs.
Fixed #5576: Calcul cc.visibleRect with visible rect of cc.view
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
Fixed #5577: Position children with cc.visibleRect