Installer::uninstall

public function uninstall(iInstallable $installable = null)
{
	if($installable)
	{
		$installable->uninstall();
	}
	else
	{
		foreach($this->getInstallable() as $installable)
		{
			if(!$installable->isInstalled())
			{
				continue;
			}

			$installable->uninstall();
		}

		self::updateInstalledVersion(0);
	}
}