Git commits in Moodle 2.8.4 by Mitsuhiro Yoshida

commit 9b1c53771a47461eaef50ac5c65f58ec07a0cae2
Author: Mitsuhiro Yoshida <mits@mitstek.com>
Date:   Sun, 22 Feb 2015 22:19:35 +0800
Tag:    v2.8.4

MDL-49259 lib: Fix for unzipped Japanese filename character corruption