Update ReadAndWrite.ino

Comments need to be corrected to match Arduino Mega pinout
Update MifareClassicValueBlock.ino

Pinout in comments does not match Arduino Mega pinout
Merge pull request #23 from WA4OSH/patch-2

Update ReadAndWrite.ino
Merge pull request #24 from WA4OSH/patch-3

Update MifareClassicValueBlock.ino
Update DumpInfo.ino

Corrected pinout in comment.  Should match Mega SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS).
Merge pull request #26 from WA4OSH/patch-2

Update DumpInfo.ino
modMFRC.c
Rename extend_MFRC522 to modMFRC.c
Create modMFRC.h
Create example_modMFRC.ino
Update modMFRC.c
Update modMFRC.h
Delete example_modMFRC.ino
Basic example of use of the functions of modMFRC

Example of 4 operation on TAG:

- Read data block
- Write data block
- write trailer (set owner KeyA)
- format card
Example of using modMFRC (read) with Ethernet module

Simple reading of a block and sending data via UDP broadcast
Example of using modMFRC (write) with Ethernet module

Waiting receive data via UDP broadcast and writing the block on the card
Fix chipSelectPin

Fix chipSelectPin to use the wifi or ethernet module
Merge pull request #1 from Spugna85/master

Merge useful fork