Git commits in Moodle 3.4.0 by Mark Johnson

commit a9ca3fa167fbcb1f01f8fa92eac671281aa026cb
Author: Mark Johnson <mark.johnson@open.ac.uk>
Date:   Thu, 26 Oct 2017 21:59:35 +0800
Tag:    v3.4.0-rc1

MDL-60600 core_output: Clear static icon system cache between unit tests


commit 7e732c5d5ab341779d6c0843ae1bc40d112ffc1d
Author: Mark Johnson <mark.johnson@open.ac.uk>
Date:   Fri, 05 May 2017 19:02:24 +0800
Tag:    v3.4.0-beta

MDL-58826 theme_boost: Prevent fatal errors in action menu behat steps