Endpoint support

This is to go along with https://github.com/my-koop/service.website/pull/186. I added a couple of example endpoints (although not used here) to show what's possible. These will be moved to https://github.com/my-koop/module.base shortly.
Am I supposed to call a cleanup callback here, following yesterday's conclusions? If so, is it provided as the third argument of the `getConnection` callback?