Git commits in Moodle 3.0.5 by Tim Hunt

commit 9a16044c219a4a80d64fbaab48756aaaeae07531
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Tue, 17 May 2016 06:14:22 +0800
Tag:    v3.0.5

MDL-54605 quiz regrading: incorrect DB query

commit 77c4401c02f28c85ee18da3ed2dacac007d81483
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Sat, 14 May 2016 03:36:30 +0800
Tag:    v3.0.5

MDL-54582 accesslib: improve performance of load_course_context

commit a4079c3c74089b7501940b609c841861b5e4ab21
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Thu, 12 May 2016 01:07:23 +0800
Tag:    v3.0.5

MDL-53938 qformat_gift: handle multi-choice MR with one 100% choice