Abstracted GrammatistaParserPhp into GrammatistaParserTokenizer

So custom tokenizer parsers can be implemented, e.g. using jTokenizer
(http://timwhitlock.info/blog/2009/11/jparser-and-jtokenizer-released/)
Added GrammatistaParserJavascript

Based on jTokenizer
(http://timwhitlock.info/blog/2009/11/jparser-and-jtokenizer-released/).
Added support for ignore comments to ignore warnings

Only Tokenizer (PHP, Javascript) and Dwoo parsers implement support so
far
Improved GrammatistaWriterFilePo to handle duplicates properly
Removed lost code