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

This was discussed at the recent custom elements F2F meeting. I believe there was general agreement that this a critical feature needed for webcomponents 'v1' implementations and that 

* the timing should be consistent with MutationObservers (microtask) 
* it is ok if the notification does not include information about the changes to the distributed nodes list.

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https://github.com/w3c/webcomponents/issues/288#issuecomment-176459160