[messaging] Minimal requirements for group chat

[Joseph Bonneau]

>
> Causal ordering.
>

Does this help solve the UI problem? We could design a chat protocol where
every participant has a Lamport clock and these are committed to in each
message as an alternative to the "git commit history" formulation
considered above. This would get us some nice guarantees and maybe even
some code to re-use, but there isn't a magic way to display messages with
these timestamps intuitively either. It's not a good sign that Wikipedia
uses diagrams like this to try and explain the concept:
http://upload.wikimedia.org/wikipedia/commons/5/55/Vector_Clock.svg
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