(bug) set default easing if none is passed
(bug) set default easing if none is passed

Jeremy017/ngFx,ChrisPTsang/ngFx,linalu1/ngFx,christiannwamba/ngFx,cristoferdomingues/ngFx,christiannwamba/ngFx,ChrisPTsang/ngFx,timonsk/ngFx,timonsk/ngFx,Jeremy017/ngFx,linalu1/ngFx,cristoferdomingues/ngFx