Publish works!

Fixes publish interface and implementation

Keep Connection and Setup

• By calling the KeepConnectionAndSetup all the connection part is handled and in case of disconnection it keeps trying to connect.
• Fix sync on closing connections

Full Changelog: v0.0.2...v0.0.3

Better close connection

Validates the channels and connections are not nil

First release

Ready to use on a service to connect to rabbitMQ

Full Changelog: https://github.com/gbeletti/rabbitmq/commits/v0.0.1