Git commits in Moodle 2.8.7 by Damyon Wiese

commit 3d517153fa273409684c9c8b619bf993fdf80f87
Author: Damyon Wiese <damyon@moodle.com>
Date:   Fri, 03 Jul 2015 16:37:54 +0800
Tag:    v2.8.7

MDL-50757 upgrade: Unset config value that will never be used again

commit e9f173e2d4a3eaf3c7db88c7c4762452e1aee173
Author: Damyon Wiese <damyon@moodle.com>
Date:   Mon, 04 May 2015 11:41:44 +0800
Tag:    v2.8.7

MDL-25138 core_tags: remove duplicated related tags