Fixed CalendarItem#update_item! when unknown attributes are passed.
Fixed CalendarItem#update_item! when unknown attributes are passed.

Tsoondev/Viewpoint,albertdang/Viewpoint,Strauman/Viewpoint,Windermere/Viewpoint,Datacom/Viewpoint,makandra/Viewpoint,Gerd82/Viewpoint,WinRb/Viewpoint,getoutreach/Viewpoint,gshutler/Viewpoint,bcherrington/Viewpoint