Added explode, explodeall, creep, lag

*explode [player] | Creates an huge explosion at a specific players
location.
*explodeall | Creates an huge explosion at all players except you.
*creep <player> <mob> <amount> | Spawns a specific mob at a specific
player.
*lag | This WILL lag the shit out of the server. So be careful and leave
the server after executing, if you don't want to play with 1 FPS (until
it crashes)!