Git commits in Moodle 2.8.7 by Nelson Moller

commit 615d97944e69316c5f513c11d7dfa1e6f941cc88
Author: Nelson Moller <nmoller@crosemont.qc.ca>
Date:   Mon, 01 Jun 2015 23:03:19 +0800
Tag:    v2.8.7

MDL-49323 mod_assign: Fixed numeric validation in grade form.