[dom] Issue #156. Add legacy event type check to invoke algorithm. (#158)

Not sure if I should link up the event type names to the transitions and animations specs, or just having them be strings is preferable.

See here for what Gecko does: https://mxr.mozilla.org/mozilla-central/source/dom/events/EventListenerManager.cpp#1237

And here for what Blink does (which is inherited from WebKit): https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/events/EventTarget.cpp&sq=package:chromium&l=351&dr=C&rcl=1452688339

r? @annevk 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/158

-- Commit Summary --

  * Issue #156. Add legacy event type check to invoke algorithm.

-- File Changes --

    M dom.bs (29)
    M dom.html (41)

-- Patch Links --

https://github.com/whatwg/dom/pull/158.patch
https://github.com/whatwg/dom/pull/158.diff

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https://github.com/whatwg/dom/pull/158