Git commits in Moodle 3.0.6 by Henning Bostelmann

commit dbf9bf0dab56674dd333aad0169e9050fe3d13d1
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Fri, 19 Aug 2016 00:01:12 +0800
Tag:    v3.0.6

MDL-55627 filter_mathjaxloader: use correct string concatenation op