Changes

* [[http://www.dfrobot.com/wiki/index.php/NFC_Module_for_Arduino_(SKU:DFR0231) Wiki Doc ]]* [[http://www.dfrobot.com/image/data/DFR0231/NFC%20Module%20for%20Arduino%20V1.0_SCH.pdf Schematic]]* [[http://www.dfrobot.com/image/data/DFR0231/NFC%20Module%20for%20Arduino%20V1.0%20layout.pdf Layout]]* [[http://www.dfrobot.com/image/data/DFR0231/pn532ds.pdf PN532 datasheet]]* [[http://www.dfrobot.com/image/data/DFR0231/pn532um.pdf PN532 user manual]]* [[http://www.dfrobot.com/image/data/DFR0231/NFCModuleSketch.zip Arduino sample sketch]]