Add Azure driver for hosts
Add maintainers file to hosts

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Add stubs for CLI documentation
Update boot2docker image with client/daemon auth
Don't clean up storage path when create fails
Move message about creating virtualbox VM

Creating the disk image takes a while
Print output from SSH in debug mode
First pass at setting up identity auth on hosts
Refactor adding key to authorized keys
Rename "docker hosts" to "docker machines"