Detect Docker version

[rgbkrk]

Rather than getting rejected by the Docker host, use the response message (or another API call) to determine the version of the Docker API that docker-py should be using. Typical message:

Error response from daemon: client and server don't have same version (client : 1.13, server: 1.12)

This may work better in docker-py, but we can put it in tmpnb before they make a release with API detection.

[rgbkrk]

Apparently you can just set 'auto' for the version. Straight from the docs.