Re: [spec-reviews] General review of Shadow DOM 2015 updates (#79)

* open/closed mode of ```attachShadow```
* ```<slot name="">``` and ```<insert-me slot="...">``` vs. ```<content select="selector">```
* removal of ```<shadow>``` element; removal of multiple shadows-per-element
* Events have a ```deepPath```, which accounts for open/close modes.
* Distribution API was dropped due to hard timing concerns--now up to the UA to do appropriately. Slot approach can make this efficient.

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