[1.7.0] Add native support for required elements

- Factored out large portion of ValidateAttributes to AttrValidator
- Implemented ValidateAttributes armor
- Fix clear cache bug
- Implement armoring for ValidateAttributes

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1174 48356398-32a2-884e-a903-53898d9a118a

maintenance/flush-htmldefinition-cache.php

@@ -2,7 +2,7 @@
 <?php
 
 /**
- * Flushes the HTMLDefinition serial cache
+ * Flushes the default HTMLDefinition serial cache
  */
 
 if (php_sapi_name() != 'cli') {
@@ -14,8 +14,10 @@ echo 'Flushing cache... ';
 
 require_once(dirname(__FILE__) . '/../library/HTMLPurifier.auto.php');
 
+$config = HTMLPurifier_Config::createDefault();
+
 $cache = new HTMLPurifier_DefinitionCache_Serializer('HTML');
-$cache->flush();
+$cache->flush($config);
 
 echo 'Cache flushed successfully.';