-addr -> multiple -H + unix

Signed-off-by: Victor Vieux <vieux@docker.com>
update README.mds

Signed-off-by: Victor Vieux <vieux@docker.com>
660 -> 600

Signed-off-by: Victor Vieux <vieux@docker.com>
see https://github.com/codegangsta/cli/issues/160

Signed-off-by: Victor Vieux <vieux@docker.com>
Merge pull request #174 from vieux/bind_multiple_hosts

--addr -> multiple -H + unix