Renamed "disablePVPBetweenNeutralFaction" to "disablePVPBetweenNeutralFactions" because the grammar nazi in me calls for it
a couple of minor optimizations
finally, include gson.jar in the lib folder
NOTE: if Essentials is too old, this error will occur at server startup (sadly impossible to catch or otherwise handle due to how Bukkit loads plugins):
java.lang.NoClassDefFoundError: com/earth2me/essentials/chat/IEssentialsChatListener