Unused TimeSpokenSince Listener

[ryannealmes]

Can we remove the following code?

// var listenTimeSpokenSince = function(socket) {
//     socket.on("timeSpokenSince", function(data) {
//         winston.log("info", "received timeSpokenSince event");
//         talk_time.time_spoken_since(data.from_time, data.participant_ids, data.hangout_id);
//     });
// };

If this isn't being used could we also remove it from talk_time?

Looking at the code I couldn't see these functions being used anywhere time_spoken_since, total_time_spoken_in_hangout and processes in talk_times.js. These are unnecessarily bloating the code.