Re: [dom] Add EventListenerOptions and passive event listeners (#82)

>  method, when invoked, must run these steps:
>  
>  <ol>
>   <li><p>If <var>callback</var> is null, terminate these steps.
>  
> + <li>Let <var>capture</var> and <var>passive</var> be false.
> +
> + <li>If <var>options</var> is a boolean, set <var>capture</var> to
> + <var>options</var>.
> +
> + <li>If <var>options</var> is a dictionary and <code>{{EventListenerOptions/capture}}</code> is
> + present in <var>options</var> with value true, then set <var>capture</var> to true.
> +
> + <li>If <var>options</var> is a dictionary and <code>{{EventListenerOptions/passive}}</code> is
> + present in <var>options</var> with value true, then set <var>passive</var> to true.

I attempted that [here](https://github.com/RByers/dom/commit/e3a2df3c7df30d68247d758c7f746ed76375b92c#diff-a467e681501e456ce8c1ef31425e1b41R1052) and I agree it looks cleaner, thanks!  I couldn't find another example of returning multiple values, is what I've done precise enough?  Any suggestion for a term better than "normalize" (which could perhaps be confused with Node.normalize)?

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