Update LeveledMobs.class

v18

* Lots of minor code clean up.
* Some of it's coding style/readability.
* Commented most of the code.
* Big changes:
** Levels are now in Metadata, so custom names are not vital
** Should not conflict with custom names from other plugins.
** Tested to work with MCMMO health bars and Infernal Mobs custom names.
** Works with name tags on leveled mobs.
* /lm reload command to reload the configs
* /lm spawnmob command to spawn a mob of a given level (for testing).
** added a level cap of 999 for now, to prevent an issue with the above command.

Currently names mobs as "level # {mobtype}", but there is room to add some config options to that as well.