0.0.0.2

General UI improvements to clean it up a bit. 

Added:

• Health bars
• Can use healthpack on other units
• Zombie alert counter at the top
• Tweaked zombie AI a bit
• Move grid should be accurate
• Moving screen when rotated should work properly now (but might be inverted; I think I forgot to fix that)
• Inventory screen pop-up to explain what the item does
• Restart button on win/lose
• Escape to exit