Git commits in Moodle 3.1.5 by Matteo Scaramuccia

commit ea76a7cde3b4bffe041a568700a1d78bb7f41a84
Author: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date:   Mon, 09 Jan 2017 04:29:47 +0800
Tag:    v3.1.5

MDL-57379 Files: Improved file argument evaluation.