Fixed spell of creature 11669 (Flame Imp) in Molten Core

Source: http://www.wowhead.com/npc=11669/flame-imp#abilities

Signed-off-by: Cala Haryon <calaftp@free.fr>
Added support for event in Blackrock Spire of Scarshield Infiltrator
morphing into Vaelan

Source: http://www.youtube.com/watch?v=VVxOPiDVwNQ
Fixed aggro text of several NPCs

Removed wrong AI scripts from various creatures and fixed random aggro
text for others.
They were previously claiming to be part of the Defias Brotherhood on
aggro though obviously were not (kobolds, skeletal mages and such)
See https://github.com/classicdb/database/issues/548
Merge pull request #2 from cala/master

3 backports from Classic DB