Git commits in Moodle 2.6.2 by Matt Petro

commit 82d0300757d1906584fe7fa2dec5a959429c24a2
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Fri, 07 Feb 2014 02:32:04 +0800
Tag:    v2.6.2

MDL-44029 mod_quiz: Fixing group deleted handler so it does not remove user overrides.