Developer credits
Git commits in Moodle 3.1.0 by Kevin Bruton
commit cfd8c0fe094cf8c14bdd59cc1b40c436f8ee5621 Author: Kevin Bruton <kevin.jose.bs@gmail.com> Date: Sun, 10 Jan 2016 07:12:58 +0800 Tag: v3.1.0-beta MDL-52568 core_cohort: added ability to return all cohorts in WS