[whatwg/dom] Set the stage for new custom element adoption semantics (#279)

This is part of implementing the consensus arrived at in https://github.com/w3c/webcomponents/issues/512. Now each custom element carries with it a custom element definition. Adoption now enqueues an adoptedCallback call.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/279

-- Commit Summary --

  * Set the stage for new custom element adoption semantics

-- File Changes --

    M dom.bs (43)
    M dom.html (111)

-- Patch Links --

https://github.com/whatwg/dom/pull/279.patch
https://github.com/whatwg/dom/pull/279.diff

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