GameArena.exit()

[ForrestFairy]

If I use .exit() method window does not close but everything just freezes

[KMatthewMarsden]

The described behavior for the exit method is

"Close this GameArena window."

This issue is correct in that on Mac and Linux at least, it does not close the window but freezes everything (as it makes exiting true..) I have fixed this in PR #5

Thanks for the issue. In future I would mention some more details such as your OS, Java version etc, but presumably this is the lab PCs?