Re: [webcomponents] Need "slotting changed" event (#288)

I definitely do not want to jeopardize buy-in. The momentum that Shadow DOM has right now is great.

I'm hoping this is a relatively easy addition, especially with the simplified slots model that has been adopted. 

I think it could be a non-bubbling event fired when MutationObservers are. Perhaps it could just be an addition to MutationObservers, and therefore decoupled from the Shadow DOM spec.

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