Git commits in Moodle 2.7.18 by Andrew Nicols

commit 76523cdfa98effd0e7dc9c9c9b80670fdb39b30c
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Fri, 07 Oct 2016 10:56:29 +0800
Tag:    v2.7.18

MDL-56225 mod_forum: Remove unnecessary attributes from update