[transport] experiment w/ sensu-transport, starting w/ the client
[transport] converted the client socket
[transport] updated server to use the transport class for rabbitmq
[transport] updated api to use transport class
[transport] removed legacy rabbitmq lib/wrapper
[transport] updated tests to use setup_transport()
[transport] try using client name for subscription queue
[transport] use a combination of client name, sensu version, and timestamp for subscription funnel
[transport] use transport ack() abstraction
[transport] use the transport loader
[transport] "amqp" handler type -> "transport"
[transport] sensu-transport is now on rubygems \o/
Merge pull request #710 from portertech/transport

Use a "transport" abstraction, enabling users to choose to use RabbitMQ, SQS, Kafka, etc.