Git merges in Moodle 2.3.9 by Dan Poltawski

commit 29d5e81473ff2e2a6ef909f8fb9b6c208eaf44b3
Author: Dan Poltawski <dan@moodle.com>
Date:   Thu, 05 Sep 2013 14:43:53 +0800
Tag:    v2.3.9

Merge branch 'install_23_STABLE' of git://git.moodle.org/moodle-install into MOODLE_23_STABLE