Log instead of silently catching ContentAPI issues.
Allow tagging content to draft tags.
Bump slimmer

This new version should reduce the number of failed builds due to
timeouts in javascript-enabled capybara features.
Merge pull request #1623 from alphagov/allow-tagging-to-draft-tags

Allow tagging content to draft tags.

https://www.pivotaltracker.com/story/show/73971142
Merge pull request #1628 from alphagov/slimmer-bump

Bump slimmer
Add sidekiq monitoring web interface

www.agileplannerapp.com/boards/173808/cards/5040

this web application exposed at '/sidekiq' allows
us to monitor queue state and manage messages.