re-implemented allCourses() comp prop with RSVP.Promise.
re-implemented allCourses() comp prop with RSVP.Promise.

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