Git commits in Moodle 2.5.2 by Jean-Philippe Gaudreau

commit 13142cece4f9012aea51d13ed3caa23b3541ee71
Author: Jean-Philippe Gaudreau <jp.gaudreau@umontreal.ca>
Date:   Thu, 22 Aug 2013 04:12:07 +0800
Tag:    v2.5.2

MDL-36093 grade export: Fix HTML special characters printed litteraly.