Java Coap Versions Save

Added

• coap over tls support [RFC 8323]
• updated content format from IATA registry

Fixed

• do not remove observation relation when server sends obs=1
• restart block transfer, when client replies with 4.13 with new block size hint
• handle block wise transfer with different token in each transaction
• allow only one accept header

Java7 backport

• rel/5.0.0-java7