Git commits in Moodle 3.3.4 by Shamim Rezaie

commit 1f05e1459a8f8df8ea8cd65a24e9f1a9aaf208cc
Author: Shamim Rezaie <shamim@moodle.com>
Date:   Mon, 27 Nov 2017 17:37:06 +0800
Tag:    v3.3.4

MDL-47114 core: Improved function description


commit 4d7d71fb37c13b3f08e950a52aedf4242366836c
Author: Shamim Rezaie <shamim@moodle.com>
Date:   Fri, 24 Nov 2017 01:06:34 +0800
Tag:    v3.3.4

MDL-60188 groups: cache user's groups and groupings