Add Newton * meter to ounce force * inch conversion.
Change counts per revolution constructor parameter to uint16_t.
Simplify Motor constructor and destructor.
Change test_motor() so both motors are tested.
Fix constant declaration.
Eliminate encoder_priv.h.
Eliminate motor_priv.h.
Eliminate status shell command, rename disablemotors shell command.
Update shell commands and tests.
Initial fork motor controller implementation.
Initial rear wheel motor controller inmplementation.
Initial motor controller abstract base class implementation.
WIP: Replacing old yaw rate and rear motor controllers with new ones.
Update Makefile.
Add BUILD_TEST option to build script.