Refactored out config

moved config to it's own class. Added config.yaml to gitignore.
Added event hostname

the hostname to use for datadog events.
Also got rid of some rouge spaces.
Refactored metrics to own file. Datadog Event API.
Automatically prepend hostname to messages
Tidied up g729 metrics
Added Shutdown event.
Changed connection event type to success

Should push as much context as possible to datadog.