Git commits in Moodle 3.6.5 by Ryan Wyllie

commit 350cb520b865111a892c645c757f89fa1380bd4d
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 28 May 2019 09:59:14 +0800
Tag:    v3.6.5

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

commit 4c74b7d17ba7f8fa7bcabb04090db7e837735e76
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 21 May 2019 11:40:36 +0800
Tag:    v3.6.5

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

commit ad4aad6c297be236b352fb32e618cce8829571c8
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Wed, 28 Nov 2018 12:08:42 +0800
Tag:    v3.6.5

MDL-65060 core_message: add render buffer to conversations