Function __autoload

Fall back to traditional autoload for old PHP versions

Package: PHPMailer
Copyright: 2012 - 2014 Marcus Bointon
Copyright: 2010 - 2012 Jim Jagielski
Copyright: 2004 - 2009 Andy Prevost
License: GNU Lesser General Public License
Author: Marcus Bointon (Synchro/coolbru) phpmailer@synchromedia.co.uk
Author: Jim Jagielski (jimjag) jimjag@gmail.com
Author: Andy Prevost (codeworxtech) codeworxtech@users.sourceforge.net
Author: Brent R. Matzelle (original founder)
Located at zp-extensions/PHPMailer/PHPMailerAutoload.php

Parameters summary
`string`	`$classname`	The name of the class to load