Git commits in Moodle 3.1.6 by John Okely

commit 21b902996a46462be1e5998bce2a51432396c7fe
Author: John Okely <john@moodle.com>
Date:   Fri, 28 Apr 2017 14:30:34 +0800
Tag:    v3.1.6

MDL-58722 mathjax: Fix httpsurl upgrade


commit 17b7ca5b2b78b5b5a938f61a0e408893f813bf73
Author: John Okely <john@moodle.com>
Date:   Tue, 21 Mar 2017 10:25:03 +0800
Tag:    v3.1.6

MDL-37168 mod_lti: Fix rename behat


commit 8da9781a25ce3703569814ad7576078a006f1efc
Author: John Okely <john@moodle.com>
Date:   Fri, 27 Jan 2017 14:59:33 +0800
Tag:    v3.1.6

MDL-37168 grade: Debugging if gradebook callbacks are not both present


commit 6f3be9d5cec8baec2990e4032f0334f188dc9796
Author: John Okely <john@moodle.com>
Date:   Tue, 10 Jan 2017 12:09:02 +0800
Tag:    v3.1.6

MDL-37168 mod_lti: Add behat test to cover lti quick edit