[0499] Removed duplicate spawns of creature 16781

* Removed duplicate spawns of some of the creatures 16781 (Midsummer
Celebrant) in Midsummer Festival game event as they were spawned at the
same place of another.
Thanks Neotmiren for pointing. This closes #60
[0500] Applied CMaNGOS core update z2478

Makes Paladin's talent Benediction reduces mana cost of Seal of
Crusader and Seal of Command. Thanks Neotmiren for pointing and fixing