title: Is TTL implemented in Pika?
body: <p>I'd like my queue to drop messages not processed within a certain time.</p>
  
  <p>I already do this in the consumer by recording the publish time. However, in the case that no-one is subcribing, it would be better for the queue to simply drop stale messages.</p>
  
  <p>Can I set a expiry time (TTL) in messages in Pika. The RabbitMQ docs talk about it but i don't see TTL references in the Pika docs.</p>