Git commits in Moodle 2.6.x by Rod Norfor

commit 03966a4ec070618492a292f86e1bd800b75f8fbd
Author: Rod Norfor <rod.norfor@open.ac.uk>
Date:   Thu, 22 May 2014 00:24:02 +0800
Tag:    v2.6.4

MDL-45654 cron: fix non-empty directories deletion