SSH to VM support

I was wondering if docker_machine will have the ability to let users ssh into the tinycore (I think? ) VM that docker for mac is running.

Some of the issues that are real blockers could be address if the user was allowed to ssh into the VM to override the limitations of the current GUI app.

ie. The out of disk space thread: https://forums.docker.com/t/consistently-out-of-disk-space-in-docker-beta/