Missing open loop servo control examples

[AndyLindsay]

Find and re-add (or just add if that's the case) the missing open loop servo control examples.

[AndyLindsay]

#include "servodiffdrive.h"

int main()

{

drive_pins(12, 13);

drive_speeds(100, 100);

pause(2000);

drive_speeds(-100, -100);

pause(2000);

drive_speeds(0, 0);

drive_sleep();

}

[AndyLindsay]

#include "servo.h"

int main()
{
servo_speed(12, 100);
pause(2000);
servo_speed(12, 50);
pause(2000);
servo_speed(12, -100);
pause(2000);
servo_speed(12, 0);
servo_disable(12);
}