quick test to support utf-8 string in metadata

Thanks for this awesome library. I have a requirement to support utf-8 string in icecast metadata - for a classical radio station (many Italian, French, Spanish, German diacritic chars). I don't have much experience with node, but I was able to create a test and add string_decoder to parse the utf8 chars. It works for me but I suspect there is a more elegant solution.