Git commits in Moodle 2.8.9 by Johannes Burk

commit e33152d912c0d6033537a0ada7fe721c06facd1d
Author: Johannes Burk <me@jojoob.de>
Date:   Thu, 25 Jun 2015 22:45:51 +0800
Tag:    v2.8.9

MDL-49750 mod_data: fix updating file/picture fields breaks references