Git commits in Moodle 2.4.8 by rwijaya

commit 172321d7d85e935fba2400ca7d652d24fa849e15
Author: rwijaya <rwijaya@moodle.com>
Date:   Tue, 10 Dec 2013 15:48:48 +0800
Tag:    v2.4.8

MDL-42104: trap tab focus within dialog modal,