Added SpeedControllerWrapper class.

This class will act as "one" Speedcontroller. This is intended to control 3
sets of CANJaguars.
Added Drivetrain and Gamepad.

Drivetrain to control 8 Wheels with 6 CANJaguars and Gamepad to control the robot.
Renamed a variable.
Added SetDrivetrainCommand.

Sets the Drivetrain to the respective parameters.
Addid GamepadDriveCommand.

Allows the values from the gamepad to be transmitted to the robot so that
it can move.
Added Gearshifter class.

Shifts the gear to change the speed of the motor: full speed or half speed.