Git commits in Moodle 2.4.5 by sam marshall

commit 122d59390fbb12b6a20cd074a52b90ac303354c7
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Wed, 15 May 2013 20:11:51 +0800
Tag:    v2.4.5

MDL-37516 Conditional activities: user field condition display fixes

commit e5bc3e3dde69e081a2994cf10e7a3e001d694893
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 02 May 2013 22:28:17 +0800
Tag:    v2.4.5

MDL-39472 MUC: Optimise cache::get_from_persist_cache

commit 02d61e04816b167da765c08250f4a66cafae894c
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 02 May 2013 01:44:55 +0800
Tag:    v2.4.5

MDL-39454 Accesslib: is_siteadmin is a bit slow