Fixed bugs:

• Issue #212: (math mt-random) raises an error on multi thread use
• Issue #219: Incorrect decode of base64

New features:

• JSON object builder (text json object-builder) has been added
• JSON representation conversion procedure alist-json->vector-json and vector-json->alist-json have been added
• ECDH and ECDHC procedure have been added to (crypto)
• Base64URL procedures have been added to (rfc base64)
• AES key wrap and unwrap procedures have been added to (crypto)
• JSON Resource Descriptor library (rfc jrd) has been added (not documented)

Improvements:

• F2m EC computation improvement
• 10% performance improvement of shifting 1 with bitwise-arithmetic-shift-left to bignum range.