Connections should retry automatically on errors

[jonafato]

When an AMQP connection is closed, the current behavior is to abort consuming once all pending messages are returned. In cases where these errors are recoverable, this is undesirable. Henson-AMQP consumers and producers should support automatically reconnecting to the server to handle these recoverable disconnects. Ideally, the implementation of this includes a configurable number of retry attempts and a delay between each attempt.