createTemperatureLookup.py: Format output for Marlin, add voltage, resistance, and resolution comments.
fastio.h: Add commented #define AT90USBxx_TEENSYPP_ASSIGNMENTS
Makefile: Use recent Arduino and enable at90usbxxx HARDWARE_MOTHERBOARD 8,81,82,83,84 using Teensyduino.
pins.h: Add Teensy++2.0 breadboard with Teensyduino Teensy++2.0 assignments.