Add Pyro4 transport

Use a Pyro proxy as channel.  Published object must implement methods
used in the Channel class for the shared_queues object. Once published
this object can be shared across multiple hosts.

Sample object backing:
https://github.com/tahmmee/pyroqueue/blob/master/pyroqueues.py
pidbox: log method errors with traceback
Copyright is now GoPivotal, Inc.
More connection tests
Connection: clone/copy must keep alternates
Merge branch '2.5'
100% coverage for kombu.connection
100% coverage for kombu.entities
100% coverage for kombu.utils.log
100% coverage for kombu.messaging
95% coverage for kombu.mixins
Forgot to add file
Attempt to fix Tox CI
Merge branch 'tahmmee/master'
cosmetics
Pyro cosmetics (Re #228)
Adds Tommie McAfee to AUTHORS
Default rabbitmq admin port is now 15672. Closes #233. Thanks to GlenRSmith
Updates Changelog
pyamqp/librabbitmq: Transport options are now forwarded as kwargs to Connection.  Closes #214.