Git merges in Moodle 2.7.13 by Dan Poltawski

commit 958b261ba3450a8f8e3cc4579baf78ddb962dc94
Author: Dan Poltawski <dan@moodle.com>
Date:   Mon, 22 Feb 2016 17:11:07 +0800
Tag:    v2.7.13

Merge branch 'install_27_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_27_STABLE