Kurt Eckhardt 4f13273546 Added SPI1 object for Teensy 3.5 test board These changes plus some changes in core (added register defines, plus added logical SPCR1 register), allowed me to do quick hack to serialFlash library and test and initialize flash memory using 3.5 test board connected to prop shield using pins 0, 1, 20 and 6		9 lat temu
examples	Update examples to use transactions	10 lat temu
README.md	Update readme	11 lat temu
SPI.cpp	Added SPI1 object for Teensy 3.5 test board	9 lat temu
SPI.h	Added SPI1 object for Teensy 3.5 test board	9 lat temu
keywords.txt	Enable SPI1 on Teensy-LC	10 lat temu

SPI Library for Teensy