Merge branch 'common_purify_branch' into 'nightly'

EndCommonPurify event

Because we have problems with htmLawed on quitter.se, we want to check its output and maybe use another HTML purifier... 

See merge request !78

lib/util.php

@@ -593,7 +593,10 @@ function common_purify($html)
 
     $html = common_remove_unicode_formatting($html);
 
-    return htmLawed($html, $config);
+    $purified = htmLawed($html, $config);
+    Event::handle('EndCommonPurify', array(&$purified, $html));
+    
+    return $purified;
 }
 
 function common_remove_unicode_formatting($text)
@@ -2458,4 +2461,4 @@ function html_sprintf()
 function _ve($var)
 {
     return var_export($var, true);
-}
+}