Also, where did createAddressBook come from? This definitely wasn't part of the [API spec](https://github.com/mikeconley/thunderbird-ensemble/wiki/Contact-Service-Connector-Interface-Proposal-Draft)...

Remember that for now, we're really only interested in *read-only* behaviour for this connector. Write will come soon, but for now, we just want to focus on reading the contacts out of a CardDAV server.