Add Minsweeper class w/ initialize method
Add Board and Tile classes
Add neighbor constant, neighbors method in Tile
Change neighbors method in Tile
Add neighbor_bomb_count, board.tile
Adds board.populate -- populates board with Tile objects
Adds @flagged, @bombed, @revealed as initial values for Tile object.
add bomb_adjacent method to Tile, play method to Minsweeper
Add display method to Minsweeper class
Populate board when new Minesweeper is initialized
Adds make_move for Minesweeper
Modifies make_move to actually make a move
Add revealed and flagged methods to Board class
Add functionality to won? and lost?
Progress on reveal method
Work on reveal method
Adds select! instead of select in Tile.neighbors -- fixes a nil problem
Fixes Reveal -- reveals empty correctly, shows correct number of adjacent bombs.
Fixes bug with game loss
Adds ability to save game by YAML