Git commits in Moodle 1.9.18 by Sam Hemelryk

commit 8925a1293492ffec799b4992d30ed832b035c280
Author: Sam Hemelryk <sam@moodle.com>
Date:   Fri, 23 Mar 2012 07:16:58 +0800
Tag:    v1.9.18

weekly release 1.9.17+