Added a Location class that allows you to provide a x, y, and z location, and optionally add a World(Minetweak), if not provided, the overworld will substitute for it.
Added a getWorld() to Location
Changed getHandle to getWorldServer in the World class for Minetweak
Added a few handy methods for Minetweak's world, had to modify Minecraft's world to allow this however.
Merge remote-tracking branch 'origin/1.6.2' into 1.6.2