better error message when rabbitmq-server isn't running.
better error message when rabbitmq-server isn't running.

After there are different backends, should probably abstract
this to a Firehose::ConnectionError. There's a
corresponding pull request to update the docs in the hombrew
package. https://github.com/mxcl/homebrew/pull/11932/files

ramontayag/firehose,firehoseio/firehose,ramontayag/firehose