Dockerfiles not exposing ports

[CVTJNII]

In the Legacy branch the dockerfiles used to expose the consul ports: https://github.com/gliderlabs/docker-consul/blob/legacy/Dockerfile#L31

This has been removed in the current Dockerfiles. Was there motivation for this or was it simply an oversight? I maintain a test suite that spins up ephemeral Consul containers to test API calls against and it's easier to map ports when they are exposed, so if this is simply an oversight I'll open a PR to add them back.