Git commits in Moodle 2.9.6 by Henning Bostelmann

commit 2779372c17b41bc93dfbc144934e1cd3de83c662
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Tue, 12 Apr 2016 02:45:26 +0800
Tag:    v2.9.6

MDL-53780 mod_assign: Remove teachers from submission group members