Remove dependency to PHP 5.4

Hi Jeffrey

Great project but I'm still with PHP 5.3

composer.json requires PHP 5.3 so I converted the PHP 5.4 arrays in unit tests to PHP 5.3 and also in Way/Console/GuardGenerator.php::applyPathsToStub(), the use of $this in the closure introduces a dependency to PHP 5.4. So I have used the implementation suggested in RFC https://wiki.php.net/rfc/closures to remove the dependency for those who have to use PHP 5.3.