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

* In 1.2.2 rabbitmq now replaced the old deprecated amqp plugin. amqp plugin are removed.

* 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
Merge pull request #210 from holms/patch-4

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