Always expose container address

[md5]

Previously, it was not possible to determine the IP address of a container without any EXPOSEd ports.

I also threw in a change to expose HostIP on the Address struct in addition to HostPort.

Fixes #79

[jwilder]

Thanks @md5

[mjaverto]

Great, thanks @md5

[md5]

👍

@jwilder Once you cut a release, I think this PR combined with #83 will make it possible to fix nginx-proxy/nginx-proxy#115

[viranch]

This changes the Docker Gen Structure, can the wiki be updated? I'd contribute but I'm not familiar with review/pull requests for wikis.

[md5]

@viranch The wiki is freely editable by the community. It would be awesome if you could update it! 👍

[viranch]

@md5 How about putting it in the README.md itself instead of linking to the wiki? I can make a PR.

[md5]

You'd have to see what @jwilder thinks. Here's the last time the discussion came up, which resulted in the current documentation on the wiki: #25

[viranch]

@md5 Opened a pull request for doc update: #96 cc @jwilder do have a look :)