First pass at a elasticsearch image.
Logstash and kibana configs.
Use json_lines on port 5000, instead of syslog.

Grok doesn't seem to like logger(1) input.
Make logstash the default kibana dashboard.
Update docker files.

- Use mattdm/fedora-small bas image.
- Use non-root users.
- Add a `MAINTAINER` line.
Fix logstash repository name.
Add some basic documentation.
Merge pull request #7 from ClusterHQ/elasticsearch

Docker files for elasticsearch stack.