Moved js/ to lib/
Porting everything to node, removed the web test runner files for existing unit tests since I can run them directly in node, renamed base64 library to b64 for brevity.
Renamed 'encode' and 'decode' within encoding libraries to 'enc' and 'dec' for brevity. Added more unit tests.
Converted RC4 encryption library to node format.
Converted XXTEA encryption algorithm as-is, which appears to not follow correct specifications to XXTEA standards. Will likely have to rewrite this.