Git commits in Moodle 2.9.2 by Nelson Moller

commit 9f3a76cb07ef1137d151af9227e78fa0a72a68cf
Author: Nelson Moller <nmoller@crosemont.qc.ca>
Date:   Fri, 14 Aug 2015 02:13:41 +0800
Tag:    v2.9.2

MDL-51090: mod_quiz grading validation of an essay question