added tests for course start/end date validation.
added tests for course start/end date validation.

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