lib.php: count ID value not all records
lib.php: fix bug in cancelled users GROUP BY and candidate status check
Bumping to version 2.3.1
README: update readme with correct maintainer information
lib.php: fix bug with missing u.id in GROUP BY clause
Merge branch 'MOODLE_26_STABLE' of https://github.com/catalyst/facetoface-2.0 into MOODLE_26_STABLE