[webcomponents] Change the order of insertion points which are involved in a re-distribution in event path (W3C bug 23887) (#42)

As the result of discussion in [W3C bug 23887](https://www.w3.org/Bugs/Public/show_bug.cgi?id=23887), I'm making a PR of the algorithm change to what so-called "candidate 2".

Both the algorithm and the example result changes are included in this PR. Charts are not updated but marked as an issue.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/42

-- Commit Summary --

  * Copied the proposed algorithm from https://bugzilla.mozilla.org/show_bug.cgi?id=1059989#c10
  * Reflected the change in https://www.w3.org/Bugs/Public/show_bug.cgi?id=23887#c163
  * Reflected the change in https://www.w3.org/Bugs/Public/show_bug.cgi?id=23887#c169
  * Fix a shadow root is not distributed but its children are
  * Editorial, including Hayato's suggestion at https://www.w3.org/Bugs/Public/show_bug.cgi?id=23887#c122
  * Bring original text back and put the new one under issues
  * s/project/distribute/
  * Editorial: rename vars to match to the current algorithm, and use <var>
  * Add the expected result of event path example with the proposed algorithm
  * Alternate algorithm to achieve the same results
  * Cleanup the alternate algorithm
  * Fix one missing "otherwise" in the alternate algorithm
  * Editorial changes
  * Fix typo
  * Editorial cleanup
  * Editorial changes
  * Exclude shadow insertion points only if it has older shadow roots
  * Merge branch 'gh-pages' into event-path-23887
  * Cleanup before PR
  * Editorial
  * Remove issues to prepare PR

-- File Changes --

    M spec/shadow/index.html (63)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/42.patch
https://github.com/w3c/webcomponents/pull/42.diff

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https://github.com/w3c/webcomponents/pull/42