added comet option to send {comet, Mode, Msg} to the callback.
added comet option to send {comet, Mode, Msg} to the callback.

nitrogen/nitrogen_core,nitrogen/nitrogen_core,choptastic/nitrogen_core,SovereignPrime/nitrogen_core,SovereignPrime/nitrogen_core,nitrogen/nitrogen_core,stuart-thackray/nitrogen_core,choptastic/nitrogen_core,nitrogen/nitrogen_core,choptastic/nitrogen_core,stuart-thackray/nitrogen_core,stuart-thackray/nitrogen_core,SovereignPrime/nitrogen_core