Alpha 4 - Saving and title screen

Hey everyone! Alpha 4 is now out! It's main features are saving and a title screen. Details:

Features:
Added title screen
Added saving and loading
Added save command to save game
Added exit command to return to the title screen
Added a 'tip' whenever you start the game about the new save and exit commands
Added changelog to download (zip)

Bug fixes:
Fixed bug that mission 6 goes on forever