Try to solve potential memory leaks

Author: jackycute

lib/realtime.js

@@ -330,6 +330,8 @@ var disconnectSocketQueue = [];
 
 function finishConnection(socket, note, user) {
     if (!socket || !note || !user) {
+        if (note) delete note;
+        if (user) delete user;
         connectionSocketQueue.pop();
         isConnectionBusy = false;
         return;