Fix parse error thrown in PHP5.5+

When running composer update the file generated by AutoloadGenerator was
not able to be parsed by php due to a require statement inside the foreach
loop.

The fix is to make the statement work the same as the
autoload_namespaces.php require is done.

Issue occured using the following php versions

PHP 5.5.1-2+debphp.org~precise+2
PHP 5.5.3-1+debphp.org~precise+2