Add very early cut of sm-dragdrop.
Build sm-dragdrop.
Rename Y.SM.DragDrop to Y.DragDrop.
Build sm-dragdrop.
Editor.DOM: Editor specific DOM utilities
Editor.Style: Implement Editor.DOM, better node cleaning
Merge branch 'editor-style'
Editor.Link: Initial commit. Link editing extension for Y.Editor
build gallery-sm-editor
Merge branch 'editor-style'