Adding a getter for uploadable listener.

This is to allow easily adding default path and other parameters directly from the service.

e.g.

		$uploadableManager = $this->get('stof_doctrine_extensions.uploadable.manager');
		$uploadableManager->getListener()->setDefaultPath('media/products');
		$uploadableManager->markEntityToUpload($entity, $entity->getFile());
fixed indentation
Merge pull request #176 from rat4m3n/patch-1

Adding a getter for uploadable listener.