improved api and updated readme

demo/hello/master.c

@@ -29,7 +29,7 @@ int main(void)
 	TF_SendSimple(1, (pu8)"Ahoj", 5);
 	TF_SendSimple(1, (pu8)"Hello", 6);
 
-	TF_QuerySimple(2, (pu8)"Query!", 6, testIdListener, 0);
+	TF_QuerySimple(2, (pu8)"Query!", 6, testIdListener, 0, NULL);
 
 	demo_sleep();
 }

demo/hello/slave.c

@@ -21,7 +21,7 @@ TF_Result replyListener(TF_Msg *msg)
 	msg->len = (TF_LEN) strlen((const char *) msg->data);
 	TF_Respond(msg);
 
-	// unsolicted reply - will not be handled
+	// unsolicited reply - will not be handled by the ID listener, which is already gone
 	msg->data = (const uint8_t *) "SPAM";
 	msg->len = 5;
 	TF_Respond(msg);