docker-machine support for use of volumes

[patcon]

I use docker-machine to run docker on a DigitalOcean instance, since my local machine has a tough time with some projects with a few containers.

It mostly works fine, and is meant to be a drop-in replacement for local docker on projects. But one thing docker-machine can't handle is local mounts (unnamed). (internally, docker expands the relative path locally like ./foo to /Users/patcon/culturestake-provisioning/foo, and so docker on the remote machine creates and mounts that empty dir on the server. Something about dockers architecture makes this not easily fixable, even though docker-machine is an official tool)

Anyhow, if you felt ok merging this, it means people both with and without powerful workstations can contribute a bit easier. No pressure.

It adds a minimal Dockerfile for containers with those previous types of mounts, now with a COPY. docker-marchine sends the whole docker context to the server, so this works fine.

Further, might be able to use docker-gen as a mulitstage volume, where processed template is copied over, but wasn't clear enough on its operation to do it.

[patcon]

But also, going to try using docker-machine with vbox, and see if i get any memory errors. So I'm not yet out of options to get this running :)