Bukkit

• Added a simple air defense system to allow players to actually defend against projectiles.
• Tweaked the speed of projectiles.
• Polished up some of the console messages relating to firing the cannon.

Careful not to use "trapping chests" in creative mode for the cannon (it won't work). Also check that your cannon is 10 blocks high when your are done. Make sure that items are correctly spelled out in the config file!! Verify that both the cannon and air defense pod face south. (When you look at the button you face south.) Chests must contain exactly the correct number of items.