Git commits in Moodle 2.8.7 by Skylar Kelty

commit 9d472d7319be9a2cf38b96c3ad555ed6e76703cf
Author: Skylar Kelty <S.Kelty@kent.ac.uk>
Date:   Mon, 18 May 2015 23:49:27 +0800
Tag:    v2.8.7

MDL-50280 WebCT import scripts don't always clean up


commit f8e680ca11368b7b782aab76f65b16d3f9a670db
Author: Skylar Kelty <S.Kelty@kent.ac.uk>
Date:   Tue, 12 May 2015 15:03:56 +0800
Tag:    v2.8.7

MDL-50169: Fix grade report SQL logic