Git commits in Moodle 3.4.0 by Mary Evans

commit 7bfebce0c0377359e43ac66b2907e94c8ac00123
Author: Mary Evans <lazydaisy@visible-expression.co.uk>
Date:   Mon, 29 May 2017 17:18:53 +0800
Tag:    v3.4.0-beta

MDL-59080 theme_boost: make drawer.scss variables default