Added main.cpp and defaults.h
* defaults.h: Added default board size.
* board.h: Defined the class Board in board.h
* board.cpp: Defined the constructors Board() and Board(int s)
* board.cpp: Defined function initializeBoard.
* board.h: Added function prototypes.
* board.cpp: Added definitions of functions.
* board.cpp: Added more function definitions
* board.h: Added more function prototypes
Completed board.h
Merge branch 'defineBoard'