Developer credits
Git commits in Moodle 2.6.6 by Michael Aherne
commit fba86dfd9806a21e2459972b7fdcd16cb7073cb9 Author: Michael Aherne <michael.aherne@strath.ac.uk> Date: Thu, 23 Oct 2014 19:05:31 +0800 Tag: v2.6.6 MDL-47793 assign: Reset reveal identities