Add ancestry to course model
Add ancestry to course model

This was added to the API some time ago and should have been added here
as well.

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