Git merges in Moodle 2.3.11 by Eloy Lafuente (stronk7)

commit 86290203d9915bc6e6ae03b57982f562120f1335
Author: Eloy Lafuente (stronk7) <stronk7@moodle.org>
Date:   Sat, 11 Jan 2014 22:57:04 +0800
Tag:    v2.3.11

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