Git commits in Moodle 3.1.0 by spvickers

commit 82f5226576c91fac3091e6a8fefde73be78f6fd3
Author: spvickers <github@spvickers.freeserve.co.uk>
Date:   Sun, 05 Apr 2015 18:05:20 +0800
Tag:    v3.1.0-beta

MDL-49754 mod_lti: Fixes to JSON format