Code for managing Cleanup of Stale Channels

You'll need to change configuration.yaml appropriately. warner.py and archiver.py should then work from the commandline. Productionalized automated deployments and running on a schedule are left unspecified because every production environment is unique

These assume default values in configuration.yaml

1. Make sure the Slackbot app is installed for your Slack
2. Add a Slackbot integration, and copy the token parameter from the URL provided

The easiest way to get an API_TOKEN is to generate an OAuth test token.

It's not nice, but it's simple and avoids the whole callback-URL-oauth-request-app-creation dance.