added ember-drag-drop library.
added ember-drag-drop library.

thecoolestguy/frontend,gboushey/frontend,ilios/frontend,gboushey/frontend,djvoa12/frontend,dartajax/frontend,gabycampagna/frontend,thecoolestguy/frontend,ilios/frontend,jrjohnson/frontend,dartajax/frontend,djvoa12/frontend,jrjohnson/frontend,gabycampagna/frontend