Imports
- github.com/Sirupsen/logrus
- github.com/codegangsta/cli
- github.com/docker/machine/drivers
- github.com/docker/machine/drivers/amazonec2
- github.com/docker/machine/drivers/azure
- github.com/docker/machine/drivers/digitalocean
- github.com/docker/machine/drivers/none
- github.com/docker/machine/drivers/virtualbox
- github.com/docker/machine/state