README.md: Updated logstash server example for 1.2.x

* In 1.2.2 rabbitmq now replaced the old deprecated amqp plugin. amqp plugin is removed from logstash 1.2.2

* Parameter 'name' is not in the list in 1.2.x docs, removed,logstash complained about it anyway http://logstash.net/docs/1.2.2/inputs/rabbitmq

* Curl and kibana recipes removed