Git commits in Moodle 2.9.1 by Nelson Moller

commit 659c60614be55380f9a90f5b59b5afcaece3984e
Author: Nelson Moller <nmoller@crosemont.qc.ca>
Date:   Mon, 01 Jun 2015 23:00:12 +0800
Tag:    v2.9.1

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