Git commits in Moodle 2.8.4 by Nelson Moller

commit 116dd8a02f8fa29b096d714c5e49357dc36c72da
Author: Nelson Moller <nmoller@cegepadistance.ca>
Date:   Thu, 22 Jan 2015 21:57:54 +0800
Tag:    v2.8.4

MDL-48929 repository_filesystem: Valide relative path against realpath