Add vhost for elasticsearch on jumpbox

It needs to be exposed for Kibana 3 to work.
Rotate elasticsearch logs and add es head

- Rotate elasticsearch logs for kibana keeping previous 21 days
Add support for raw proxy config to proxy_vhost
Add firewall rules for elasticsearch
Limit allowed HTTP verbs to elasticsearch

Only allow GET, HEAD and OPTIONS.
We do not want people writing to our log indexes from outside our
network.
Merge pull request #75 from alphagov/add-es-stuff

Add elasticsearch extra configuration