Distance measure

Added manipulation of the board. Currently measures the distance.

If the board has changed since the last
//USE
ManipBoard tool = new ManipBoard();
tool.updateBoard(board);
int distance = tool.distTo(node1, node2);

Using distTo, you can find the distance between any 2 explored nodes,
regardless of if you are in that square or not.

I have made a global variable called tool_ in WumpusGame where the map
can be updated as it is explored.
creates new distance board on update

this allows the starting board to not matter, update will always refresh
distance size and board size.
forgot to increment size of board