Resolved Issue #10

We have successfully implemented the option to pause the game and also save the game into a serialized state which can be loaded back again to continue the game.  If you resume the game and no save state is available, the default is set to easy.  Saved file is saved as Saved.ser.  The Pause button is on the top of the game's frame and the save & exit button is on the bottom of the frame in a smaller button.  Everything is completed as per requested issues.

@gonfunko
#10 
~requested 250