Few changes for AND 3 #9

Add optional REGISTER extras to overview 72484badf7

Share identity during UNREGISTER ... 43421d1eb1

This may be helpful when writing some distributor
that doesn't keep any state of the registrations

Send UNREGISTERED when the unregistration is processed ... 470399b67e

This isn't useful to send it right after the reception since the
end user application already invalidate or remove the token of
this registration when sending this intent

Clarify a distributor can send NETWORK fail ...

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4500ede947

Even if an endpoint may have been updated and invalidate,
but it can't know because of network issue