Git commits in Moodle 2.7.4 by sam marshall

commit f2830925e53706e65ab23f0fcc6ddcc8b087e1a2
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Tue, 09 Dec 2014 20:42:14 +0800
Tag:    v2.7.4

MDL-48452 Completion: Expected date doesn't save when form is locked


commit beadba759a95fd81f2ef8220196e3d35971c5d1e
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Wed, 12 Nov 2014 00:38:26 +0800
Tag:    v2.7.4

MDL-48179 Backup progress: Can time out when compressing large backup


commit fc7a247b546d193556969f509d07199a5cd065a2
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 06 Nov 2014 19:54:09 +0800
Tag:    v2.7.4

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