Git commits in Moodle 2.8.12 by Dan Marsden

commit aca2ff0ad1ca0e21d9f9af4e0dd115aa415fffb4
Author: Dan Marsden <dan@danmarsden.com>
Date:   Wed, 30 Mar 2016 05:03:25 +0800
Tag:    v2.8.12

MDL-53546 SCORM: Set window.opener to null