Mods to SPI built-in lib, by Pat Deegan (http://flyingcarsandstuff.com/), to allow for multiple SPI ports and remove hard-coded values for MISO/MOSI/SCK etc.
See SPI.h for details and usage.
Refinements to multi-port SPI library, including valid control registers for dynamic usage (SPSR,SPDR,SPCR now work in 3rd party libs, when using dynamic port settings), refinements to naming conventions and additional documentation.
Pat Deegan, Nov 4 2014.
Merge pull request #34 from psychogenic/xmegaduino

Multi-port SPI library patch