Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

@esprehn pointed out to me that I may know understand all of the implications of using `display: contents` fully. For example, do elements that have that applied still match styles? Should `slot { color: red }` result in assigned elements inheriting red? Will `<slot contenteditable>` do anything? Looking at [the spec](http://www.w3.org/TR/css-display-3/#valdef-display-contents), I am not sure. Adding @TabAtkins, because he probably does.

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