Re: [dom] Change DOMTokenList's add() return value. (#114)

So I went over the HTML spec and picked up all the relevant attributes.
DOMTokenList:
--------------------
`classList`
`a.relList`
`area.relList`
`link.relList`

DOMSettableTokenList:
--------------------------------
`output.htmlFor`
`tablecell.headers`
`element.dropZone`
`link.sizes`
`a.ping`
`iframe.sandbox`
`area.ping`

As far as I can tell we can split them into:

* Need "supported tokens" - `link.relList`, `iframe.sandbox`, `element.dropZone`, `a.relList`, `area.relList`
* Will never ever need "supported tokens" - `classList`, `link.sizes`, `tablecell.headers`, `output.htmlFor`, `a.ping`, `area.ping`

Does that make sense?

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