Merge pull request #44 from alphagov/bump_slimmer

Bump slimmer to 3.16.0
Add missing labels to feedback form

Also includes a fix for an issue with the URL
field caused by the new styles.
Merge pull request #45 from alphagov/add-labels-to-feedback

Add missing labels to feedback form
Bump slimmer to 3.17.0

To enable us to fix the breadcrumb markup