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

@zcorpan 

I was also a bit surprised to discover that in https://github.com/whatwg/dom/issues/111#issuecomment-158381138

I think we should change the return value only and not change the other behavior.

@yoavweiss 

A tri-state return value seems necessary, yes. Enums are string, so the question is only what the strings should be.

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