Add support for autoload. We're not, however, using it by default.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1511 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier.autoload.php

@@ -0,0 +1,7 @@
+<?php
+
+if (function_exists('spl_autoload_register')) {
+  spl_autoload_register(array('HTMLPurifier', 'autoload'));
+} elseif (!function_exists('__autoload')) {
+  function __autoload($class) {return HTMLPurifier::autoload($class);}
+}