Git commits in Moodle 2.6.x by Dan Bennett

commit 642298073cf2ebb5ceb6d51df488c58a246a333d
Author: Dan Bennett <dan@howtomoodle.com>
Date:   Fri, 17 Oct 2014 18:03:36 +0800
Tag:    v2.6.6

MDL-46332 : Display of 'Remove' button in Add/Remove Groups in Grouping