User/logan evans serial interface

@irwineffect

This merges some code from feat/communication. The files that will be of particular interest to you are spinal_tap.py and display_messages.py. I'm not sure what the format is for the serial communication, so I put in some (obviously bad) guesses. If you start both programs (e.g. "python spinal_tap.py", etc.), then the terminal running display_messages.py should print out the messages.