Version 2.0.0

* Abstract interface to RFID readers drivers.

* Implementation of an abstract ISO-15693 API.

* ISO-15693 API implementation for the S6350 Texas Instrument
  RFID reader.

* Handle multiple simultaneous ISO RFID transponders.

Version 1.0.1

* Exclusive lock to prevent concurrency.

* rfid(3) interface blocks signals to ensure
  integrity of the RFID reader.

* The rfid_write function can be specified a specific
  RFID transponder and will refuse to write on another.

Version 1.0.0
