APDU features and utility for byte handling

Extended APDU can be split in multiple standard APDUs
send multiple byte array as one
utils for byte and hex handling
fixed @link annotation
Merge pull request #5 from jolau/master

Extended APDU can be split in multiple standard APDUs
send multiple byte array as one
utils for byte and hex handlingAPDU features and utility for byte handling

also added util classes. I think they are also useful...