Moved config & permission checks into scaleHealth method to simplify code.
remove call to copyDefaults to prevent re-inserting removed entries from the max-hp-per-level config.

cached use-permissions setting for quicker checks.

moved configuration setup into reloadConfig method in preparation for a /levelhealth reload command
added /levelhealth reload command
Merge pull request #2 from andrepl/master

Thanks, sorry about not merging yet. Will upload new plugin version later today.