Re: [dom] Add EventListenerOptions (#82)

It's addressed by what [@smaug--- said](https://github.com/RByers/EventListenerOptions/issues/20#issuecomment-137698318).  I.e. whether or not a particular event is `cancelable` is not the purview of DOM, it's up to the individual specs.  So a handler being added 'too late' is the same as other scenarios where a non-cancelable event is received by a handler, so already covered by the DOM spec.  If we can get consensus here, then I'll add something to touch-events (w3c/touch-events/#6) that indicates that a TouchEvent may be uncancelable if, at the time it was first received, there are no mayCancel=true handlers for it.  WDYT?  Is there something more I should add here (perhaps expand on the note?).

Regarding discussion, I thought there were enough separate non-trivial issues (with non-trivial discussion history) that it was valuable to continue to use a separate issue tracker for them.  But if you prefer I can try to close them all and merge all discussion into this PR.  I don't have a preference on whether minor editorial discussion occurs here or in separate issues.  But I defer to you on all of this - what's easiest for you at this stage?

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