Git commits in Moodle 3.1.0 by Jan C. Dageförde

commit 496929a2e8fb9e9b49a6b61809d5c6e219a8bc85
Author: Jan C. Dageförde <jan.dagefoerde@ercis.uni-muenster.de>
Date:   Wed, 09 Mar 2016 23:45:42 +0800
Tag:    v3.1.0-beta

MDL-53407 themes: Add CSS class `editing` only if appropriate