Fixing error message when no suitable driver found
Fixing error message when no suitable driver found

Right now The error message is misleading in case of a non existing driver: "boot2docker-vm": machine not supported
Its not the machine which is not supported, but the driver

    $ boot2docker --driver=nosuchdriver info

    Boot2Docker-cli version: v1.3.0
    Git commit: 1d0b71b
    error in run: Failed to get machine "boot2docker-vm": machine not supported

nathanleclaire/boot2docker-cli,SvenDowideit/boot2docker-cli,vmware/boot2docker-cli,vmware/boot2docker-cli,boot2docker/boot2docker-cli,beni55/boot2docker-cli,SvenDowideit/boot2docker-cli,beni55/boot2docker-cli,nathanleclaire/boot2docker-cli,mattrobenolt/boot2docker-cli,boot2docker/boot2docker-cli,tianon/boot2docker-cli,tianon/boot2docker-cli,mattrobenolt/boot2docker-cli,moxiegirl/boot2docker-cli,moxiegirl/boot2docker-cli