[2.1.0] Optimize ConfigSchema to only perform safety checks when HTMLPURIFIER_SCHEMA_STRICT is true

- Remove useless ->revision check in Config.php
- Add simple trace file to benchmarks folder

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1319 48356398-32a2-884e-a903-53898d9a118a

benchmarks/Trace.php

@@ -0,0 +1,12 @@
+<?php
+
+ini_set('xdebug.trace_format', 1);
+ini_set('xdebug.show_mem_delta', true);
+
+xdebug_start_trace(dirname(__FILE__) . '/Trace');
+require_once '../library/HTMLPurifier.auto.php';
+
+$purifier = new HTMLPurifier();
+
+$data = $purifier->purify(file_get_contents('samples/Lexer/4.html'));
+xdebug_stop_trace();