Git commits in Moodle 3.4.0 by Mark Sharp

commit 2a477bf08e5eab1615775cc9b76846b6cece86ae
Author: Mark Sharp <m.sharp@chi.ac.uk>
Date:   Mon, 05 Jun 2017 16:41:42 +0800
Tag:    v3.4.0-beta

MDL-59125 filter_urltolink: ignoretags on nolink span