Git commits in Moodle 3.4.6 by Markku Riekkinen

commit 65dc7eba8d5fa42a4cf23847da56e27c5da7530e
Author: Markku Riekkinen <markku.riekkinen@aalto.fi>
Date:   Thu, 20 Sep 2018 20:00:52 +0800
Tag:    v3.4.6

MDL-61981 filter_mathjaxloader: add unit tests


commit 5acd022bf63d04d90e33d935937be234db483d84
Author: Markku Riekkinen <markku.riekkinen@aalto.fi>
Date:   Wed, 19 Sep 2018 17:04:23 +0800
Tag:    v3.4.6

MDL-61981 filter_mathjaxloader: nested math environments