Developer credits

Git commits in Moodle 2.9.5 by Colin Campbell

commit 7bed522217f99fb417d8a259da9e172ecf97bbb7
Author: Colin Campbell <colin@umn.edu>
Date:   Mon, 02 Nov 2015 23:45:36 +0800
Tag:    v2.9.5

MDL-51715 lib/grade: Unit test for aggregationweight

commit f2f35e85d8945e913c8b6bc55791e90d0018c32c
Author: Colin Campbell <colin@umn.edu>
Date:   Sat, 10 Oct 2015 00:14:04 +0800
Tag:    v2.9.5

MDL-51715 lib/grade: Zero out aggregationweight for novalue and dropped