making add to async-mode

src/table.cpp

@@ -25,8 +25,8 @@ void WorkerTable::Get(Blob keys,
 void WorkerTable::Add(Blob keys, Blob values,
                       const UpdateOption* option) {
   MONITOR_BEGIN(WORKER_TABLE_SYNC_ADD)
-  Wait(AddAsync(keys, values, option));
-  //AddAsync(keys, values, option);
+  //Wait(AddAsync(keys, values, option));
+  AddAsync(keys, values, option);
   MONITOR_END(WORKER_TABLE_SYNC_ADD)
 }