Introduce "last player standing" to death event.

It is now possible to check if an arena player who died was the last
player alive in the arena. Useful for special rewards and stuff.
ArenaCompleteEvent: s/winners/survivors
Add unbreakable-weapons and unbreakable-armor.
Add baby zombie villagers
Tossing IntelliJ a bone.
Switch to floating point numbers for locations.

This allows spawnpoints and warps to be specified more precisely.
Add classchest command.

The classchest command can be used to link a chest to a class directly
(although still in the same world) without having to position them in
a specific pillar under the signs.
Remember to add the actual command class ;)
StringBuffer => StringBuilder, thanks IntelliJ ^_^
Add world name to coords.
Make sure we load AFTER Multiverse, just in case.
Fix lobby region expansion command.
Multiworld exit-warp and location formatting.
Multiworld leaderboards.
Correct leaderboards error message.
Make sure we can force worlds.
Lazy initialization of selected arena.

This fixes issues with having to restart the server for "not ready"
type messages.
Set world-node when world changes.
World-change code for set(lobby)region.
Fix "no class items on class selected".

The fix is simply a reload of the config-file after initially loading
the config-file. For some reason it works. No clue why >_>