New Quantities in the AdminShop and Mob Drops info

Added some new quantities to the AdminShop.
Added buying and selling of Ender Pearls, since at the moment I'm unable to change what Enderman drop.
All mobs drop (with about a 60% chance) 1 gold ingot. This translates to roughly the same worth they had when they gave their killer currency. Ghasts drop, with a better chance, 1-3 diamond.
Also, this negates the problem with mobs giving their killer money when killed with a bow and arrow. Now they drop these items regardless of how they die. With a chance, of course.