Fix Quest "The First Trial" (9678)

Sangrias Stillblade will be spawned and attack the player after light the brazier.

http://www.wowhead.com/quest=9678
https://www.youtube.com/watch?v=IFcdAWWEM4I#t=2m25s
https://www.youtube.com/watch?v=KQgvQUeBKrA

ToDo's
- Sangrias Stillblade is missing his polearm. It has the same model like chillpike (http://www.wowhead.com/item=13148).
- Fix charge animation. Seems like an issue of the core.

Script adapted from http://stormrage.tomsk.ru/hg/trinitycore/raw-file/46613e106bcd/src/server/scripts/World/go_scripts.cpp