Git commits in Moodle 2.9.0 by Nelson Moller

commit 413907cff3c1cd504c1b7cbaac616190bb6090c4
Author: Nelson Moller <nmoller@cegepadistance.ca>
Date:   Thu, 22 Jan 2015 21:57:54 +0800
Tag:    v2.9.0-beta

MDL-48929 repository_filesystem: Valide relative path against realpath