Merge branch 'unix_socket'
Add CopyFromContainer

implements: http://docs.docker.io/en/latest/api/docker_remote_api_v1.6/#id18
WIP, I need to add tests now
Add tests
Merge branch 'copy_from_container' of github.com:gemnasium/go-dockerclient
container/copy: improve test coverage
container: minor tweaks to docs
example: fix function name