Minor patching, mostly switching a printf to a pabort, so it correctly exits if you pass bad parameters. Also, added a newline to one of the debug statements.
Original source (spi.c) was GPL licensed. That means that this has to *also* be GPL licensed, converting to CC-BY-SA is of dubious legal validity.
See http://wiki.creativecommons.org/GPL_compatibility_use_cases
As such, I'm updating the readme.
Merge pull request #2 from fake-name/master

Minor changes, and a fix to the license