Re: [heycam/webidl] Specify open dictionaries. (#180)

@bzbarsky: agreed. If we're going with half-open down the road, we may want to converge towards a single model that can have 0.._n_ members and may be open-ended, e.g.:

```webidl
// opended, no members
dictionary CSSStyles {
  openended<DOMString, DOMString>;
}

// openended, some defined members
dictionary PaintOptions {
  DOMString? fillPattern = "black";
  DOMString? strokePattern = null;
  Point position;
  openended<DOMString, any>;
};
```

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