Git commits in Moodle 2.8.6 by Skylar Kelty

commit 4b55cb7109917fa07b1b2b474c7b41b687e0eb06
Author: Skylar Kelty <S.Kelty@kent.ac.uk>
Date:   Mon, 16 Mar 2015 17:22:53 +0800
Tag:    v2.8.6

MDL-49489 caching: Prevent full coursecontact purge