Git commits in Moodle 2.3.1 by Davo Smith

commit 5200c254a12c962c319d58ec8cba35bc620a07a2
Author: Davo Smith <git@davosmith.co.uk>
Date:   Tue, 26 Jun 2012 19:05:04 +0800
Tag:    v2.3.1

MDL-34029 update mod/upgrade.txt to include course drag and drop upload