This fixes brewing on the newest Spigot API builds. The Alchemy skill was completely broken due to a change in the Spigot BrewEvent constructor, which this fixes via the changes to FakeBrewEvent.java and AlchemyPotionBrewer.java. This also adds a check in EntityListener.java for armor stands, so that health bars aren't displayed for them. The health bars never really displayed properly (armor stand health acts differently from most entities), and it allowed players to punch invisible armor stands server admins may have been intentionally hiding to temporarily reveal them via a health bar, which is an issue.
