Domain info command response exposes a single status

The domain info command returns [zero or more statuses](http://tools.ietf.org/html/rfc5731#section-3.1.2). Right now only the first one is exposed by the client but all of them should be returned.

This is a minor change but wouldn't be backwards compatible since `response.status` no longer returns a `String` but an `Array`.

An alternative approach may be adding a `statuses` method that returns all of them and leave the `status` method returning only the first one. I leave that up for discussion.