Merge pull request #18 from rackerlabs/vagrant

Add Vagrantfile and configs
vagrant: Add docker stop to user-data

The docker service has to be stopped before the docker-tcp.socket
service attempts to run so we stop it first. docker-tcp.socket will
restart the docker.service and we'll be listening on a port. This is
required for port forwarding into the host.
configs: Add elasticsearch container
README: Add Elasticsearch container