While working on #2428 I found myself wanting to reload the server frequently. This is working great and reducing my iteration time significantly. I should have tackled this way sooner! 🙊
I’ve left `verbose` on which seems useful, at least in the short term while we’re tuning the configuration.
Close#2426
This implements the configuration mechanism I described in #2621. The heavy lifting is delegated to [node-config](https://github.com/lorenwest/node-config) with a minor assist from [dotenv](https://github.com/motdotla/dotenv).
`private/secret.json` has been replaced with environment variables and/or `config/local.yml`. See `doc/server-secrets.md`.
