removed users:online set

using websockets.getConnectedClients directly

src/controllers/users.js

@@ -15,7 +15,7 @@ usersController.getOnlineUsers = function(req, res, next) {
 			user.getUsersFromSet('users:online', 0, 49, next);
 		},
 		count: function(next) {
-			db.sortedSetCard('users:online', next);
+			next(null, websockets.getConnectedClients().length);
 		},
 		isAdministrator: function(next) {
 			user.isAdministrator(uid, next);