Configurable parent classes

[marliotto]

I'd like to change parent class for generated classes.

For example

$mondator = new Mondator();
$mondator->setConfigClasses($configClasses);
$mondator->setExtensions(array(
    new Mandango\Extension\Core(array(
        'metadata_factory_class'  => 'Model\Mapping\Metadata',
        'metadata_factory_output' => __DIR__.'/Model/Mapping',
        'default_output'          => __DIR__.'/Model',
        'repository_parent_class' => \App\Mandango\MyRepository::class,
        'query_parent_class' => \App\Mandango\MyQuery::class,
        'document_parent_class' => \App\Mandango\MyDocument::class,
        'embedded_document_parent_class' => \App\Mandango\MyEmbeddedDocument::class,
    )),
    new Mandango\Extension\DocumentArrayAccess(),
    new Mandango\Extension\DocumentPropertyOverloading(),
    new Mandango\Extension\DocumentInitializer()
));
$mondator->process();