Adds mypaas.toml configuration file

[hydroid7]

This is a configuration addition for deployments using mypaas.toml file. For now, it only adds the possibility to ignore certain directories with an ignore pattern.

Documentation included.

[almarklein]

Thanks! This looks really well done.

The linter is complaining. I suspect this is because the latest black has some updates. Could you run black . to update the formatting?