Re: [whatwg/dom] Disconnect single target instead of all (#126)

@trusktr 
So, the records should know which nodes they are for?
Then, I also think it's a sound and simpler behavior.

```js
// node A is a descendant of node B
observer.observe(A, {subtree: true, attributes: true});
observer.observe(B, {attributes: true});
// mutation queued: add a class attribute to node B
observer._queue = [{for: new Set([A, B]), message: "a class attribute added to B"}]
observer.unobserve(B);
// queue filtering. remove B from `for` attribute, and if `for` gets empty, the mutation record is thrown away
observer._queue = [{for: new Set([A]), message: "a class attribute added to B"}]
```

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