[dom] Add Attr#nodeName (#171)

https://dom.spec.whatwg.org/#attr

>   readonly attribute DOMString name;

Add `nodeName` as an alias. 10091 resources from 470k pages match `REGEXP_MATCH(content, r'\.attributes\[[a-zA-Z0-9\. -]+\]\.nodeName')` (dataset httparchive:har.chrome_jan_15_2016_requests). Also Live DOM Viewer. :-)

See http://logs.glob.uno/?c=freenode%23whatwg&s=22+Feb+2016&e=22+Feb+2016#c985861

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https://github.com/whatwg/dom/issues/171