Re: [WICG/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

P.S. I really like the literal API proposal, because it allows the Behavior class to eventually have those methods and be the argument passed along to `new ElementObserver(behavior)` ... heck, expanding the API to accept attributes and a filter, would basically replace Custom Elements and/or the need of a globally shared registry.

```js
const eo = new ElementObserver({
  attributeChangedCallback(element, name, oldValue, newValue) {
  },
  connectedCallback(element) {
    // do things with element
  },
  disconnectedCallback(element) {
    // do things with element
  }
});

eo.observe(element, {
  attributes: true,
  attributesFilter: ['only', 'these', 'attributes']
});
```

I think I'll play around a bit with this, also making `connectedCallback` and `disconnectedCallback` optional through the configuration object (hints for the property name welcome).

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