rework classloader

- make it available in config
- always use classloader, no manual require
- compatible for future composer alternative

min_extras/config.php

@@ -4,9 +4,6 @@
 
 require dirname(__FILE__) . '/../min/config.php';
 
-require "$min_libPath/Minify/Loader.php";
-Minify_Loader::register();
-
 $minifyCachePath = isset($min_cachePath) 
     ? $min_cachePath 
     : '';