Add check for CVE-2013-1635 (only for 5.3.22 and 5.4.x before 5.4.13)

Pull request for issue 28 - Add check for CVE-2013-1635 (only for 5.3.22 and 5.4.x before 5.4.13)

Also adds --php="2.4.6" to specify which version of PHP you wish to run the rules against (default to PHP_VERSION).

Unit test added too