public function releaseVersion($version_id, $release_date = null, array $params = array())
	{
		if ( !$release_date ) {
			$release_date = date('Y-m-d');
		}

		$params = array_merge(
			array(
				'releaseDate' => $release_date,
				'released' => true,
			),
			$params
		);

		return $this->updateVersion($version_id, $params);
	}