Add #379.

Related to https://github.com/atoum/atoum/pull/379.
Maybe you may add a link to [documentation of the variadic operator[(http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list), and add `...` to help the reader. Ellipsis is a C/C++ idiom and variadic is a PHP 5.6 feature, so i think that most of atoum's end-user don't know it.