Git commits in Moodle 2.9.3 by Jakob

commit 19ad96aee3252015d21cfc8ad68ba0ded472a7ca
Author: Jakob <jackermann@onlineschool.ca>
Date:   Wed, 04 Nov 2015 02:41:03 +0800
Tag:    v2.9.3

MDL-51899 mod/assign: Allow 0.00 grades while editing a grade.