Git commits in Moodle 2.8.x by Jan C. Dageförde

commit 0da8db7426704a50de05ef8d58f957159d587d27
Author: Jan C. Dageförde <jan.dagefoerde@ercis.uni-muenster.de>
Date:   Wed, 07 Oct 2015 13:51:24 +0800
Tag:    v2.8.9

MDL-51679 course: Update groupmode CSS class