[0512] Fixed drop rate of items for quest 485 and 2766
* Also fixed movement speed of the NPC (running was slower than walking)
This closes #423 and closes #424

Signed-off-by: Cala Haryon <calaftp@free.fr>
[0513] Fixed conditions of gossip of creature 15498
* Fixed conditions of gossip of creature 15498 (Windcaller Yessendra) in Cenarion Hold. Previously her gossip options allowed player to get back the epic quest rewards she provides without having complete the quests first
This closes #400

Signed-off-by: Cala Haryon <calaftp@free.fr>