[0867] Improved movement for creature 412 in Duskwood

* Improved Stitches script used at end of quest 252 (Translation to
Ello) to make it closer to what it was on retail:
- Stitches is now neutral at spawn and will no longer kill Abercrombrie
- Stitches turns hostile when reaching the road
- Stitches now attacks the Night Watch guards on its way to Darkshire
- Town Crier (creature 468) now has several yells to inform players of
Stitches progress toward Darkshire
- Prevented Stitches to spawn twice
Source: http://www.wowwiki.com/Quest:Translation_to_Ello
http://www.wowwiki.com/Stitches
http://www.youtube.com/watch?v=rS0rjcQ6YMc