adding the possibility to check if the tick thread is gone (#187)

* adding the possibility to check if the tick thread is gone

* use join to wait for thread

pysyncobj/syncobj.py

@@ -291,6 +291,21 @@ def destroy(self):
         else:
             self._doDestroy()
 
+    def tick_thread_alive(self):
+        """
+        Check if the tick thread is alive.
+        """
+        if self.__thread and self.__thread.is_alive():
+            return True
+        return False
+
+    def destroy_synchronous(self):
+        """
+        Correctly destroy SyncObj. Stop autoTickThread, close connections, etc. and ensure the threads are gone.
+        """
+        self.destroy()
+        self.__thread.join()
+
     def waitReady(self):
         """
         Waits until the transport is ready for operation.