Git commits in Moodle 2.5.0 by Howard Miller

commit 540b8834fab874f297a18c7f55b1afe5af829d6d
Author: Howard Miller <howard@e-learndesign.co.uk>
Date:   Tue, 05 Feb 2013 16:15:43 +0800
Tag:    v2.5.0-beta

MDL-37797 HTML block: add contextid to block_positions query and make it more unique.