Fix bug involving autoclose and inline elements in strict <blockquote>.

The newest autoclose code uses the elements property in whether or not an
element should be closed by a particular tag.  The heuristic is simple; if
the element doesn't allow that tag as a child, it closes the parent
container.  This doesn't work, however, with <blockquote>, which while not
allowing inline styles under Strict doctypes, requires them to be passed
through MakeWellFormed.

The fix was to transition MakeWellFormed to call a method to retrieve the
elements, and then have StrictBlockquote implement a special version of
this method.  Future versions of HTML Purifier may be more flexible in this
regard--further study of the HTML5 specification is required.

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

library/HTMLPurifier/Strategy/MakeWellFormed.php

@@ -140,7 +140,7 @@ class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
                     
                     $parent = array_pop($this->currentNesting);
                     if (isset($definition->info[$parent->name])) {
-                        $elements = $definition->info[$parent->name]->child->elements;
+                        $elements = $definition->info[$parent->name]->child->getNonAutoCloseElements($config);
                         $autoclose = !isset($elements[$token->name]);
                     } else {
                         $autoclose = false;