Auto recovery connection publishers and consumers

[Gsantomaggio]

Closes: #4
Closes: #5

RecoveryConfiguration

RecoveryConfiguration struct is now part of rabbitmq_amqp.AmqpConnOptions:

amqpConnection, err := rabbitmq_amqp.Dial(context.Background(), []string{"amqp://"}, &rabbitmq_amqp.AmqpConnOptions{
                  SASLType:    amqp.SASLTypeAnonymous(),
                  RecoveryConfiguration: &rabbitmq_amqp.RecoveryConfiguration{
			ActiveRecovery:           true,
			BackOffReconnectInterval: 5 * time.Second, 			
                         MaxReconnectAttempts: 5,
		},
	})

Enabled by default if not specified.
You can turn it off by setting ActiveRecovery=false

Producers and consumers will be restored automatically if the network is reconnected. See the reliable example to deal with network disconnection.