Render docker-compose file

[mariotoffia]

This is split out from Issue #108 since this is much more heavy lifting task. Almost all docker-compose models are created. It needs to have a builder that may allow for building a docker-compose file. This builder should be possible to run "publicly" to allow for just rendering a docker-compose file without even running it.

It shall alos be possible to spawn this docker-compose file using the current standard mechanism.