V1.5.0
- added handling of ColdDamage for tamed mounts (horse, donkey, mule) ->
Horse class not fully supportet by Bukkit yet (build 2807)
  So Horse handling not functional yet.
- made ColdDamage event and event handler ready for handling players and
mounts
- improved timer logic to handle defined amount of players each tick
(applyColdDamageTimer now free running, but only on-demand)
- added a separate damage task for handling mounts
- build against CB 1.6.1-R0.1