Producing Docker images

[objectified]

Next to OS packages, it would be nice if vdist could produce Docker images, as this is becoming a more and more popular way of deploying applications. Producing these images through vdist, would allow us to create "build time dependency free" images, as opposed to how Docker images are usually created and shipped (having all the build time dependencies such as development packages, compilers etc. on board - that doesn't seem like a good practice to me).

The idea here is that vdist will run a docker container, wraps up your project, and then creates a new Docker image that contains just your project, its runtime dependencies and possibly a valid command to actually start your daemon (if it's a daemon).