- Ocean's shootAt method now:
   * calls the relevant Ship's shootAt method.
   * updates the number of sunken ships.
- The game now tells the player how they did when they sink all the ships.
- Ship's okToPlaceShipAt method: bug fixed.
- Testing mode added.
- Game results are now printed from a dedicated method.
- Quit option added to BattleshipGame's getRowOrColInput method.
- quitGame method created and is used by both the getRowOrColInput method and the main method.