Implement "carryover" functionality, requested by Kinderlehrer <bitweaver@7doves.com>

This commit is a limited implementation of the "active formatting
elements" algorithm implemented in HTML5, which preserves certain
formatting elements such as <a> and <b> when exiting or entering nodes.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

library/HTMLPurifier/ChildDef/StrictBlockquote.php

@@ -15,7 +15,7 @@ class HTMLPurifier_ChildDef_StrictBlockquote extends HTMLPurifier_ChildDef_Requi
      * @note We don't want MakeWellFormed to auto-close inline elements since
      *       they might be allowed.
      */
-    public function getNonAutoCloseElements($config) {
+    public function getAllowedElements($config) {
         $this->init($config);
         return $this->fake_elements;
     }