(idea partially borrowed from devenv.sh)

Although this is in name a Nickel–Nix integration, we could push it a bit further and integrate it with other tooling to make the developer's lifes easier.

A few ideas:

• Have a simple process management built into the tool (like the way devenv uses Procfiles)
• Generate CI config from a Nickel description
• Generate docker-compose files
• Provide a generic mechanism for generating arbitrary config files