Re: [dom] cloneNode underspecified for attribute copying (#30)

I'm not sure it would---_node_@[[attributeList]] would still contain pointers to the `Attr`s, although they would have their `ownerElement` changed. But yeah I assumed 3 was the intent. Implemented as https://github.com/tmpvar/jsdom/commit/31f48412eb0d430c078f85b2fb0a04fcdf64528b#diff-862b36375afbeb26674b60568127dd8cR349, maybe I can PR the spec later.

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