Implementing robust amqp (RabbitMQ) support
 * added input-backoff and output-backoff options to specify retry delays (both default to one second)
 * amqp input and output now perform their own reconnection logic instead of relying on node-amqp
Merge pull request #4 from brightcove/feature/robust-amqp

Implementing robust amqp (RabbitMQ) support