Re: [w3c/webcomponents] Events whose composed flag should be true (#513)

I can think of a few examples where `TransitionEvent` and `AnimationEvent ` have been helpful in v0.

A ripple animation as the result of a button press: http://jsbin.com/yobuloralo/edit?html,output. A component consumer may want to wait for the animation to finish before doing more work (and thus preventing jank). 

A mobile app drawer sliding in/out (as the result of a user interaction). Users may want to know when the drawer has fully opened.

A dialog overlay that transitions in (as the result of a user interaction). Users may want to know when the dialog's transition is done.

The component _could_ fire fire a custom event, but that requires more boilerplate for its author. It's natural to listen for the animation events the component is already firing.

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