Work on ONMjs.observers.SelectedJsonModelView...

... Reworked with new observer style of providing attach/detach methods that encapsulate the actual registration details while still allowing external applcication logic to wire everything up. I want everything (except for the tighly-coupled ONMjs core classes) to be de-couled. This extended to ONMjs-lib bundled observers which should not go off connecting themselves to other objects when they're constructed (as I was doing in preliminary test code). This is just bad precendent. It's a little more work to make squeeky clean observers but it's so worth it!