Change unacceptable value default behavior to drop silently.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@269 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Strategy.php

@@ -8,6 +8,12 @@
  * features, such as custom tags, custom parsing of text, etc.
  */
 
+HTMLPurifier_ConfigDef::define(
+    'Core', 'EscapeInvalidTags', false,
+    'When true, invalid tags will be written back to the document as plain '.
+    'text.  Otherwise, they are silently dropped.'
+);
+ 
 class HTMLPurifier_Strategy
 {