DragDrop: Cancel a reorder operation if the reorderbefore or reorderafter events are prevented.
DragDrop: Add touchCancelDistance and touchDelay attrs for better control over touch drag interactions.
TreeView: Add a `force` option to renderChildren() and renderNode().

If true, things will be re-rendered from scratch even if the DOM nodes
already exist.
Build sm-dragdrop and sm-treeview.
Merge branch 'master' of github.com:smugmug/yui-gallery