• Removed -t option from worker command.
  
• Added support for multiple named queues.
  
• Added retries attribute to Minion::Job.
  
• Added retries argument to fail_job, finish_job and retry_job methods in Minion::Backend::File and
  Minion::Backend::Pg.
  
• Added queue option to enqueue method in Minion.
  
• Added queue option to enqueue and retry_job methods in Minion::Backend::File and Minion::Backend::Pg.
  
• Added queues option to dequeue methods in Minion::Worker, Minion::Backend::File and Minion::Backend::Pg.
  
• Added -q option to job and worker commands.
  
• Improved worker command to be more resilient to time jumps.
  
• Fixed a race condition in Minion::Backend::File and Minion::Backend::Pg where a retried job did not have to be
  dequeued again before it could be finished.