Merged Code (Implemented the grabbers)

+ CloseDoors command; Closes the doors after a timed delay
+ PickUpBall command; Closes the doors on the ball
+ stopClosingDoors() and startClosingDoors(); respectively sets the
motor speed to 0 and sets the motor speed to close.
* Renamed method in Launcher and PushBall (launchBall())
* TODO: rename launcher class
* TODO: Test TIME_TO_CLOSE_DOORS
* TODO: Test DOOR_CLOSE_SPEED
Drivetrain Repairs