Git commits in Moodle 2.7.5 by sam marshall

commit 848dd93bf2cc2d43dd22c477669d03857405eaba
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Mon, 05 Jan 2015 23:46:09 +0800
Tag:    v2.7.5

MDL-48660 Availability: filter_user_list() should respect 'view hidden'