Re: [whatwg/dom] Consider boolean interface for properties (#461)

@jonathanKingston not sure if this helps but I've implemented the `toggleAttribute(attr[, force])` and I'm validating it via:

```js
var button = create('button');
button.toggleAttribute('disabled');
console.assert(button.disabled);
button.toggleAttribute('disabled');
console.assert(!button.disabled);
button.toggleAttribute('disabled', false);
console.assert(!button.disabled);
button.toggleAttribute('disabled');
console.assert(button.disabled);
button.toggleAttribute('disabled', true);
console.assert(button.disabled);
button.toggleAttribute('disabled', false);
console.assert(!button.disabled);
button.toggleAttribute('disabled', true);
console.assert(button.disabled);
```

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