Things to add to jefferies tube

1. All of our spec/support files we use all the time (the canonical source for these is in the rails_application_template project)
   • capybara.rb: requires capybara rspec and sets driver to poltergeist
   • database_cleaner.rb: sets transactional/truncation strategies appropriately
   • devise.rb: includes the controller test helpers
   • capybara_screenshot.rb: this could maybe go in capybara.rb
   • timecop.rb: let's us do it 'does a thing', timecop: :freeze which is super useful
2. Concerns
   • Archivable
   • Some sort of auth token concern