SPI Transactions for AVR
SPI Transactions for Arduino Due
Move Ethernet socket level stuff to utility/socket.cpp
Use SPI transactions in Ethernet library
Use SPI transaction in Ethernet W5100 init
Use SPI transactions and SPISettings in SD library
Add SPI_HAS_TRANSACTION symbol for Arduino Due
Fix interrupt masking on Arduino Due
Merge pull request #2223 from PaulStoffregen/ide-1.5.x

SPI Transactions