[dom] Several references are now wrong after Bikeshed conversion (#17)

@tabatkins 

[URL], [ENCODING], [WebIDL] point to wrong specs

[HTML5] should not be there

There is both [SELECTORS-4] and [SELECTORS4], neither of which point to the correct URL http://dev.w3.org/csswg/selectors-4/

There is both [UIEVENTS] and [UI-EVENTS]

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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/17