Facility for Global Configuration

[illegalprime]

Provide some way of inserting configuration or secrets (probably with a file for each).
So a conf file could be:

port: 3000
production: true
plugins:
  slack:
    some_non_secret_conf: Hello

A secrets file is similar, but contains info we can't include in the public biodomes repo:

plugins:
  twitter:
    api_key: 3243546787543546789

Also be able to override some / all of these options through environment variables.