Adding leftTile, rightTile, lowerTile, and upperTile objects to each Tile, as well as getters and setters for each. Added a method in Floor to populate these tiles once the current floor has finished being loaded. I'm not sure if this is the best way to do this, but it keeps us moving. I left the test logging in the buildAdjacentTiles method for now because I want to do a little more testing to make sure everything is working as intended.