Add support for Kibana 4

This changeset updates the version of Kibana from 3.x to 4.x. In addition to the Kibana update, ElasticSearch is now run as its own service instead of depending on the embedded ElasticSearch inside of Logstash.

See for more details: https://github.com/azavea/ansible-kibana/pull/2
Only if we ever expand to an ElasticSearch cluster. Right now ElasticSearch and Kibana both live on the same host.