Add proper cli

[scientes]

It would be nice to be able to Set options via the commandline and via config and be able to make other commands in the future (a first install guide which helps Set the config)

cement would be a good lib for that(it also comes with integrated Support for config files like yaml and json and also custom config handlers like env vars) but we also could make it without a lib

This would also close #20

[provinzio]

Do you think of an more enhanced cli than what we have right now with make and just starting the script?