Renamed library from RFID to MFRC522 (RFID seemed to generic).
Register names changed to comply with datasheet.
Global defines moved into class.
All constants, functions and parameters are now commented in English.
Code refactored, most function names have changed.
Now supports ISO-14443-3 anti collission and 4/7/10 byte UIDs (cascade levels).
Added functions for MIFARE Classic Decrement/Increment/Restore/Transfer and MIFARE Ultralight Write.
New examples written.