Add an input socket, and optional output archive
Log events to statsd for graphite fun

* all, all by-host
* http status code, all and by-host
Add missing commas - had broken map.jinja :(
Update CHANGELOG
shorten statsd names - hitting graphite limit
Merge branch 'pkg_update_redux' into pkg_update_redux_plus_input_output

Conflicts:
	logstash/map.jinja
Merge branch 'pkg_update_redux' into pkg_update_redux_plus_input_output

Conflicts:
	logstash/logstash.sls
Add request_time timing data for all nginx logs

So that - as well as status code hits - we get an idea of how long things are taking.
Allow for overriding of the archive log area

The logstash.archive_log_dir contents are going to grow pretty quickly,
so ensure that we can override the location away from the root disk
if needed.

This will likely be to /data/logstash/archive, so also make sure /data/logstash
is created.
Merge pull request #28 from ministryofjustice/pkg_update_redux_plus_input_output

Input file processing; Archive logging; basic statsd logging of events.