Git commits in Moodle 2.5.x by Chris Wharton

commit fe6eeced0b2775863fb197d2d5d112580bed4757
Author: Chris Wharton <chrisw@catalyst.net.nz>
Date:   Thu, 18 Jul 2013 09:44:26 +0800
Tag:    v2.5.2

MDL-40700 cache: Validate memcache key prefix field

commit 7605dba31b94ef6676c283f96d497e0f249dd5e7
Author: Chris Wharton <chrisw@catalyst.net.nz>
Date:   Fri, 15 Mar 2013 06:35:14 +0800
Tag:    v2.5.0-beta

MDl-38494 user: Fix uploaded datetime profile fields