Docker helpers for FAKE

[Krzysztof-Cieslak]

Looking at https://github.com/jet/kafunk/blob/master/support/Cluster.fsx I think it's high time to create Docker helpers for FAKE.

I've talked abut it with Steffen some time ago, but there wasn't anyone else who would use it / asking about this feature. But since it looks like you guys are using Docker, and FAKE together, I think it might be good idea to create normal, nicer helpers for Docker.

CC: @forki

[forki]

I'm in if jet thinks it's a good idea and would start using it.

[cararemixed]

That's a hacked up portion of a bigger docker script I use for developing something else so it was easy to copy and remove things than deal with writing it from scratch again. Right now it's also a separate script but it makes sense to clean up the root script to do the running.

As far as docker support, we use a collection of docker and other things which my internal script supports. Perhaps we could make it smart enough to allow a few different kind of process runners? Docker, Service Fabric, basic shell, Nomad, &c...