[whatwg/dom] Make Attr inherit from Node again (#299)

Unfortunately AttrExodus never quite became the success we all wished
it would be and the benefits with Attr no longer taking children (yay)
are rather marginal anyway.

The biggest change is to the compareDocumentPosition() algorithm. Other
noteworthy changes are that all attribute creation now needs to set a
node document.

Fixes #102.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/299

-- Commit Summary --

  * Make Attr inherit from Node again

-- File Changes --

    M dom.bs (289)
    M dom.html (208)

-- Patch Links --

https://github.com/whatwg/dom/pull/299.patch
https://github.com/whatwg/dom/pull/299.diff

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