Git commits in Moodle 3.7.0 by zpottie

commit 7a02f020c389f6cc56bb54d25d9106c0b4d2641e
Author: zpottie <zander.potgieter@yahoo.com>
Date:   Thu, 02 May 2019 13:17:22 +0800
Tag:    v3.7.0-beta

MDL-58315 core: Add support for custom block classes