Git commits in Moodle 2.8.7 by Barry Oosthuizen

commit cbb3c3e0b96528ac4155d7c5d1ae538e2285c0d3
Author: Barry Oosthuizen <barry.oosthuizen@nottingham.ac.uk>
Date:   Mon, 08 Jun 2015 16:25:44 +0800
Tag:    v2.8.7

MDL-49959 course: Fix hidden drag and drop message