Alerts on Camus Errors

[jsuresh]

This would be a useful feature, camus is of course designed to reliable deploy broker, however defense in depth.

Something as simple as a -rollbar server flag is all we really need here. It could even be a nice feature whereby application stdout/stderr (if configured as such) was synced off to a logging service instead of /dev/null. @latos @soulplant @timbod7 @timcerexhe