Git commits in Moodle 2.5.6 by Dan Marsden

commit bf5a0651b1037d9ef0cb1e70959e008aad632b3b
Author: Dan Marsden <dan@danmarsden.com>
Date:   Wed, 26 Mar 2014 16:42:09 +0800
Tag:    v2.5.6

MDL-44753 SCORM: add check during SCORM restore to make sure valid launch sco is set