sync with rev 1277 upstream

forum/skins/default/media/js/wmd/showdown.js

@@ -167,6 +167,9 @@ this.makeHtml = function(text) {
 	// attacklab: Restore tildes
 	text = text.replace(/~T/g,"~");
 
+        text = text.replace(/&amp;lt;/g,"<");
+        text = text.replace(/&amp;gt;/g,">");
+
 	return text;
 }