Add script for creature 1493 (Mok'Rash)

Mok'Rash in Stranglethorn Vale (near Booty Bay) will now yell to tease
NPCs (and players). Texts are official, timer is based on the period of
the GO transport coming near Mok'Rash location.
Source: http://www.wowwiki.com/Mok%27rash
Merge pull request #14 from cala/mokrash

Add script for creature 1493 (Mok'Rash)