Re: [webcomponents] Replace attached/detached callbacks with insertedIntoDocument/removedFromDocument (#362)

I think I did this in https://github.com/w3c/webcomponents/commit/2d07c73a1f5a00bf3f4655995273772fa57b1a02. I ended up passing the document since to me it doesn't seem at all clear that the element's node document is equal to the parent node's containing document. Happy to fix if wrong.

See https://w3c.github.io/webcomponents/spec/custom/#custom-element-lifecycle for rendered output

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