updates for prototype v4
more testing for new v4 prototype
checking spi
more tests
split leonardo tests into separate files
sd tests added. gondola code fixed for power down servo
utils for tests
working radio and sd!
minor changes
put radio and sdinit in begin()
cleaned code slightly, added more comments
sd and radio working without delays
made sdtest default, changed filename for #define
added an spiCleanBus that sends 0x00 to radio.  This allows radio to keep working after sdwrite, and doesnt need a miso resistor
added cleanSPIBus()
defaults to checking sd
python scripts to process and feed gcode files
commented out radio stuff after found it was causing problems
adapted file from old polargraph
makes tty raw by default