Added the AT86RF231 to the bookshelf and the BOM resources

- BOOKSHELF (at86rf231): the AT86RF231, successor of the AT86RF230
- BOOKSHELF (avt2027, aes): the AT86RF231's AES module
- BOOKSHELF: moved the aliases "transceiver", "txrx", and "atrf" from the
  AT86RF230 to the AT86RF231
- BOOKSHELF: added aliases "rf230" and "rf231" for the transceivers
- bom/atrf.equ, bom/dk/digi-key.equ: added the AT86RF231(-ZU)

BOOKSHELF

@@ -7,10 +7,15 @@
 #
 
 N: at86rf230
+A: rf230
+D: http://www.atmel.com/dyn/resources/prod_documents/doc5131.pdf
+
+N: at86rf231
+A: rf231
 A: transceiver
 A: txrx
 A: atrf
-D: http://www.atmel.com/dyn/resources/prod_documents/doc5131.pdf
+D: http://www.atmel.com/dyn/resources/prod_documents/doc8111.pdf
 
 N: c8051f326
 A: mcu
@@ -48,6 +53,11 @@ A: at86rf230-design
 A: design
 D: http://www.atmel.com/dyn/resources/prod_documents/doc8092.pdf
 
+# AVR2027: AES Security Module
+N: avr2027
+A: aes
+D: http://www.atmel.com/dyn/resources/prod_documents/doc8260.pdf
+
 # Mini-USB B receptacle (this footprint is fairly universal)
 N: mini_usb_b
 D: http://jae-connector.com/en/pdf/SJ037525.pdf

bom/atrf.equ

@@ -1,6 +1,7 @@
 #EQU
 
 ATMEL AT86RF230		ATMEL AT86RF230-ZU
+ATMEL AT86RF231		ATMEL AT86RF231-ZU
 SILABS C8051F320	SILABS C8051F320-GQ
 SILABS C8051F326	SILABS C8051F326-GM
 

bom/dk/digi-key.equ

@@ -3,6 +3,7 @@
 # MCUs
 
 DIGI-KEY AT86RF230-ZU-ND		ATMEL AT86RF230-ZU
+DIGI-KEY AT86RF231-ZU-ND		ATMEL AT86RF231-ZU
 
 DIGI-KEY 336-1259-ND			SILABS C8051F320-GQ
 DIGI-KEY 336-1296-5-ND			SILABS C8051F326-GM