feel free to keep it strictly simple...
Autoloader

LEPTON-CMS comes up with a autoloader function, basicly for the internal (core) functionalityand mainly for modules for there own functionalyties.
The basic syntax for own module classes is

<module_name>.php

inside the modulesdirectory:
~/<module_name>/classes/.php

Example given:
Assumee the LEPTON module is named "display_code", then
the autoloader is looking for a class-defination inside

~/modules/display_code/classes/display_code.php

Combinations with sub-themes are possible:
display_code_interface(.php)
display_code_parser(.php)
display_code_superglobals_combinations(.php)

The LEPTON-autoloader is still looking inside "display_code/classes/" for theese files.

example

module: lib_twig
file: ~/modules/lib_twig/classes/lib_twig.php

class lib_twig
{
	/**
	 * Registers Twig_Autoloader as an SPL autoloader.
	 *
	 * @param bool $prepend Whether to prepend the autoloader or not.
	 */
	public static function register($prepend = false)
	{
	// class goes on here
}

call inside module/template;

//	Use the internal LEPTON autoloader
lib_twig::register();