Git commits in Moodle 2.9.1 by Barry Oosthuizen

commit 7955318e4576cf01e0cbdcc7514fc543b4df1b08
Author: Barry Oosthuizen <barry.oosthuizen@nottingham.ac.uk>
Date:   Mon, 08 Jun 2015 16:25:44 +0800
Tag:    v2.9.1

MDL-49959 course: Fix hidden drag and drop message