GameState must not be called in GameState superclass constructor.
GSM now has a variable representing the next map.
MapName is now given in Area constructor.
Map name is now given in PlayState constructor.
Added startGame() method.
setMessageText, not setText...
ExitButton now exits the app.
newGameButton now start new game.
mapNameField is now stored in a private field.
Made stage and skin private.
Buttons now actually work.
Imports.