should wac ontology be given an https base?

Given that the acl ontology is now redirecting permanently to the https url, should
that be the new base? 

```bash
curl -i http://www.w3.org/ns/auth/acl
HTTP/1.1 301 Moved Permanently
Location: https://www.w3.org/ns/auth/acl
```

There are good reasons to have a security vocabulary served over a secure channel...