Initial stab at a config file
README: Add cloud-config.yaml sample
README: Update config example

- Naming the systems in this way doesn't make sense
- Add comment lines
README: Add logstash configuration

I think this is a reasonable way to handle inserting various logstash
sample configurations into the pre-built container.
README: 2 space yaml
Merge pull request #1 from rackerlabs/config_format

Initial stab at a config file