stop on 'docker run' errors

This broke due to our workaround for
https://github.com/docker/docker/issues/8632, which affects Docker
version 1.3.0 only, so now we refuse to run with that.

Fixes #233.
`docker --version` is not a documented option.  `docker -v`, `docker --version=false, ` and `docker version` are, although `docker --version=false` doesn't actually work.