This version of the HtmlStreamTokenizer is optimized for Scone: 
* Some problems occuring with wired whitespaces and errorneous tags were removed.
* An error in tag.unEscape() was removed.
* Problems with not commented script commands were removed.
* Quotes in Tags cannot be closed by > anymore, except the tag string is already quite long (>4096 Characters or >512 and CR present) or the > is followed by a CR.
* Newlines inside the tags don't cause problems any more and are removed.
* Errorneous quotes are now handled more tolerantly, e.g. <img src="pic.gif""> is no problem (several heuristics are being used...).
* Added T_IFRAME tag
* </script> - Tags within "document.write" are no longer interpreted as the real closing tag.
* Empty tags do not throw an exception any more but return and null tag.