[0665] Assigned quests 7462 & 7877 to their respective faction

* Assigned each quest only one faction
Quest 7877 Horde - http://www.wowhead.com/quest=7877 (The Treasure of the Shen'dralar)
Quest 7462 Alliance - http://www.wowhead.com/quest=7462 (The Treasure of the Shen'dralar)
This closes #514

Signed-off-by: Cala Haryon <calaftp@free.fr>
[0666] Fixed texts for quest 3115

* Fixed textes for quest 3115 (Tainted Memorandum) which were refering
to actual player name
Thanks Zingzah for pointing. This closes #516
[0667] Lowered respawn time of GO 176785

* Lowered to 10 min the spawntime of gameobject 176785 (Ammo Crate) used
in quest Ammo for Rumbleshot
Thanks Zingzah for pointing, this closes #518