Added a game_win, updated game_over
The player wins when they have the egg in their position and they have made it to position 1,1 without being eaten.
game_over and game_win now retract all facts and restart the game.
updated some comments.
Dragon now moves onto the player whenever they end their turn next to them
added an additional pathme that will kill the player if they end their turn next to the dragon, stealing the egg is now harder.
Merge pull request #15 from OliverBarronCarter/dev

Merge pull request #15 (dev branch) game_win state and improved pathfinding.