Progress on ONMjs.observers.NavigatorModelView....

... This commit features on getting NavigatorModelView to respond correctly to onCreateNamespace store events. I had forgottne that the navigator relied on ONMjs.Store's observer state feature so I had to get that working with addresses. It's still kind of fresh as their's a newly-implemented ONMjs.Address.getHashString function underpining the resolution of namespace-specific observer state (ultimately - observer state is segments by observerId, then pathID (breaks all the address hashes into smaller groups for faster resolution), and finally by address hash string.