rock cannot adapt to docker 1.8.1.

[ghost]

bash-4.3$ docker -v
Docker version 1.8.1, build d12ea79
bash-4.3$ rock docker
Checking Docker version
Client API version: 1.15
Go version (client): go1.5
OS/Arch (client): darwin/amd64
2015/09/02 09:41:44 Error: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.15/version: dial unix /var/run/docker.sock: connect: no such file or directory