Git commits in Moodle 2.9.3 by Matt Davidson

commit f755308c8cac38acef04c64d676553ee681ff97c
Author: Matt Davidson <davidso1@rose-hulman.edu>
Date:   Fri, 23 Oct 2015 21:36:25 +0800
Tag:    v2.9.3

MDL-51779 assign: PDF annotate quality