Fleshed out CANTalon interface; it currently works just to write a
throttle. The firmware doesn't fully support everything yet, so we are
still significantly limited.
Change-Id: I2868c4c168a8cb42cda754589777beef31ffd354
CANSpeedController is a subinterface of SpeedController that adds method
prototypes and enums for all of the common smart speed controller features.
CANJaguar implements this interfaces. CANTalon does too, but
most methods are stubs right now.
Change-Id: I67e0177d91e45444657280502a247d787ad5c74c
