Git commits in Moodle 3.4.1 by Shamim Rezaie

commit 00268741c27e73de07d4a0f73e9a6add6f85261a
Author: Shamim Rezaie <shamim@moodle.com>
Date:   Mon, 27 Nov 2017 17:37:06 +0800
Tag:    v3.4.1

MDL-47114 core: Improved function description

commit b8e0488c90a1b09b8d720eac9320c61944a664f9
Author: Shamim Rezaie <shamim@moodle.com>
Date:   Mon, 27 Nov 2017 10:19:29 +0800
Tag:    v3.4.1

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