def work(*tubes)
      options = tubes.last.is_a?(Hash) ? tubes.pop : {}
      worker_class = options[:worker] || configuration.default_worker
      worker_class.start(tubes)
    end
Begins working on jobs enqueued with optional tubes specified

@example
Backburner.work('newsletter_sender', 'test_job')
Backburner.work('newsletter_sender', 'test_job', :worker => NotSimpleWorker)