Keep RF/SL stuff up to date to avoid random failures
Refactor lock test to simplify it

There's no need to create a new user.
Mark tests as non-critical as they are randomly failing on CI
Fix Robot Test Report notification links
Fix AttributeError caused by editing a basic tile and not populating the image field.
Move changelog entry to top.
Merge pull request #443 from enfold/master

Fix AttributeError caused by editing a basic tile and not populating the image field.
Update gettext translatable strings
Pin up version of pep8 to avoid failures on CI
Merge branch 'master' into issue_438

Conflicts:
	CHANGES.rst