DB/Item: Northrend Mystery Gem Pouch (3.3.5)

* This is probably only valid for 3.3.5 as item is marked as no longer available in game and last comment on wowhead is from 4.1.0 saying item is now worthless, was added in 3.2
* Remove northrend rare gems for emblem of heroism from Lhara and replace with this item
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into ghbb