Implemented redstone comparators

They can be placed and toggled, but stills needs proper redstone support
Added moar mobs!

+ Added dragons
+ Added golems
+ Added giants
+ Added horses
+ Added some missing items
+ Added missing spawn egg metas
Fixed pickups
Fixed new monster aggressiveness issue
Implemented xoft's suggestions
Fixed pickup block spawning
Merge branch 'bugfixes' of git://github.com/tigerw/MCServer into tigerw-bugfixes