Merge pull request #123 from richardc/bug/master/51

maint - make 'rake deb' work again

Fixes the issue @vincent-lauria notes in the comment to PR #51
22603 - add rabbitmq.use_reply_exchange

RabbitMQ's federation mirrors only exchanges, so any reply to client
has to be send using direct exchange instead of (temp-)queue.

Adds rabbitmq.use_reply_exchange option that enables new reply behaviour.
Add tests for rabbitmq.use_reply_exchange

This patch also relays the make_target tests as I found the previous
version too dense to easily update.