Create minesweeper.rb, begin Board and Tile classes.
Add Tile#reveal method.
Add Tile#display_status and Board#display methods
Fixes bomb bug and neighbors map bug.
Creates Tile#flag method.
Add MineSweeper class not yet functional.
Complete requirements for functional MineSweeper class.
Adds MineSweeper#load_game and Minesweeper#save_game and modifies MineSweeper#play to load or save a game with YAML.
Makes it pretty.
Fixes grid printing bug(use correct dimension).