contacts: fall back to bare jid for d/handle (to never show jid resource)

index: maintain only one contact with type 'self' This isn't done in an event handler of contacts collection because doing it in 'add' handler would trigger 'sort' event after the model has been added, but before its 'add' event has propagated, and that's dumb.

provision: run as user 'vagrant' by default to remove synced_folder hack

index: update relative timestamps every 15 seconds

contacts: hash bare jid for fallback avatar background color

index: handle contact profile updates

rivets: more idiomatic first-letter formatter

index: also store bare jid in contact

css: missing presence message style

contacts: add avatars and fallback option (background color from hashed jid)