Git commits in Moodle 2.8.1 by sam marshall

commit b0ac83b82bb0e9a7b93b58819baf3209d6c85c9e
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 06 Nov 2014 19:54:09 +0800
Tag:    v2.8.1

MDL-48093 HTML 5 video: Firefox now supports .mp4