Git commits in Moodle 2.4.x by David Penner

commit 7547a5a3d69a421f10430d78c70ca418d30956ef
Author: David Penner <contributor@tracker.moodle.org>
Date:   Wed, 18 Jan 2012 11:19:27 +0800
Tag:    v2.4.0-beta

MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.