Updated Version to 2.0_dev
Fixed /mm count displaying incorrect chunk counts
Added Mob SpawnRates + Bonus Health/Damage
MobManager v2.0

- Added multi-world support for the new MobAttributes settings
- Added missing licence information
- Changed MobAttributes (BonusHealth) to be slimplier to handle
- BonusHealth now scales the entities old HP to the entities new max HP
- Added MobAttributes information to config headers