Git commits in Moodle 2.4.5 by Troy Lee

commit 6b3ca4dd2c6411bc9b22a58e6a048ddeab29160e
Author: Troy Lee <troy.lee2008@gmail.com>
Date:   Thu, 09 May 2013 10:13:46 +0800
Tag:    v2.4.5

MDL-36020 overview/report: fix quiz regrade session lock