Re: [webcomponents] Custom elements disconnected from a document should not be upgraded (#419)

One result of internal discussion so far is that @esprehn would prefer "no" for the two "unresolved questions" in https://github.com/w3c/webcomponents/issues/419#issuecomment-194640804. Since that's the first concrete implementer preference we've seen I'll change the spec in that direction. And comments like https://github.com/w3c/webcomponents/issues/419#issuecomment-194905641 imply that even though I thought it would be more developer-friendly that way, it might just be confusing, so all evidence is leaning toward that.

So---elements created during fragment parsing and during cloning will not auto-upgrade. (Hmm, I'll rename the flag to auto-upgrade, instead of upgradeable.)

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