R1:a97968b9ff98

Conpherence - people widget

Summary:
adds ye olde people widget. Features include

- handle-based display, so we get status for free. (Note less pretty than M14 would have it!)
- can add a person
- can remove a person
- can see the people already in the conpherence

Test Plan: added and removed people and noted they joined / re-added as appropriate. Tried to add someone already in the conpherence and got a "transaction has no effect" message

Reviewers: epriestley, chad

Reviewed By: epriestley

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