Git commits in Moodle 3.3.0 by Skylar Kelty

commit 30fccfcd8240e1c48edbf21dc1219e492a606a4c
Author: Skylar Kelty <s.kelty@kent.ac.uk>
Date:   Thu, 13 Apr 2017 17:36:05 +0800
Tag:    v3.3.0-beta

MDL-58590 mobile: Cache mobile-supporting plugins

commit 09fc9a69abd8c9690380c1df242cc759af1fb7d5
Author: Skylar Kelty <S.Kelty@kent.ac.uk>
Date:   Fri, 31 Mar 2017 23:12:48 +0800
Tag:    v3.3.0-beta

MDL-58456 chat: Add missing new in throw