Updated to version 0.2.0. Updated protocols to make everything optional. Added lifecycle methods to AtkDragAndDropManagerDelegate. This allows a delegate to handle things like 'dragDropped'. Added shouldDragStart and dragWillStart to AtkDragSource Protocol. This allows a drag source to setup data that drop zones can look at and decide if they wany to be dropped upon in the new shouldDragStart method of AtkDropZoneProtocol.