Docker Machine Guide (VirtualBox on Mac OS X)

For convenience I ended up with two aliases: "dm" for "docker-machine", and "dmenv" for "eval $(docker-machine env dev)".

But before all that, I simply downloaded and used the docker toolbox installer for OS X. I opted to skip the Kitemaric install because why? Otherwise it did the right thing with existing virtualbox install, found and imported my existing boot2docker vmdk, etc.