Git commits in Moodle 2.7.1 by Jean-Michel Vedrine

commit 1130c181f95effbff024a3cbd78033f57af6db31
Author: Jean-Michel Vedrine <vedrine@vedrine.org>
Date:   Sat, 24 May 2014 05:08:36 +0800
Tag:    v2.7.1

MDL-45686 qtype_multichoice get_num_selected_choices return wrong result