Update ResourceController.php

[mschakulat]

Declaration of PhlyRestfully\ResourceController::deleteList() should be compatible with Zend\Mvc\Controller\AbstractRestfulController::deleteList($data)

[weierophinney]

Accomplished with #135.

PHP allows reducing the number of required arguments in extending classes (doing so follows the LSP). As such, having no arguments, or an optional argument, for deleteList() is still valid. #135 updates the class to add $data = [].