This line of code is unecessary:
if(version_compare(PHP_VERSION, '5.3.0', '<'))
die('These classes are using Closures and other features that are available since PHP version 5.3.0. You are running PHP version '.PHP_VERSION.'. Please update your PHP.');
Because of closures in the source code, PHP 5.0+ will raise a parse error before the above line would be executed.
Another thing. You are using fluent interfaces, so will you try to port this class to PHP 5.0+? It's possible from the technical point of view.