Merge pull request #2 from ricomoss/dev

Pull in changes from main fork
Fix Fire Demon and Demonic Imp

Removed unnecessary methods from Demonic Imp. Fixed level 10 ability for
Fire Demon (Immunity). Fixed Concentration damage calculation for Fire
Demon to be more similar to what Goblin Cupid uses (easier to read as
well).
Merge pull request #9 from Taikero/dev

Fix Demonic Imp and Fire Demon