Not working with the latest version of Docker

[ghost]

I guess that it is due to the changes in docker-client lib asking for a second parameter.

https://github.com/ehazlett/docker-havok/blob/master/engine/engine.go#L56 https://github.com/samalba/dockerclient/blob/master/dockerclient.go#L47

https://github.com/ehazlett/docker-havok/blob/master/engine/engine.go#L315 https://github.com/samalba/dockerclient/blob/master/dockerclient.go#L443