Git commits in Moodle 3.7.1 by Ryan Wyllie

commit 48b3e4e9b24dc47905b62a4cbc15061345cb5da6
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 28 May 2019 09:59:14 +0800
Tag:    v3.7.1

MDL-65657 message: reduce message poll timer for behat tests

commit 946533c6238985d934eccd4e92e485f929214d60
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 21 May 2019 11:40:36 +0800
Tag:    v3.7.1

MDL-65657 message: revert polling timeout back to old algorithm

commit 67b64f85e95c2fd96fe7674e3c45fe57fb8d011c
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Wed, 28 Nov 2018 12:08:42 +0800
Tag:    v3.7.1

MDL-65060 core_message: add render buffer to conversations