added missing entrys to soap controller's classmap

This was motivated by the following error which came up while trying out the SearchOrders example as a result of php's type hinting (see error message below)

PHP Catchable fatal error: Argument 1 passed to SoapCall_SearchOrders::responseInterpretation() must be an instance of PlentySoapResponse_SearchOrders, instance of stdClass given, called in ~/SoapClient/examples/SearchOrders/SoapCall_SearchOrders.class.php on line 45 and defined in ~/SoapClient/examples/SearchOrders/SoapCall_SearchOrders.class.php on line 104