Ghost: Mount - Cataclysm Update

This is a fan update of Ghost: Mount to work with Cataclysm.

I hope that it gets folded into the original addon.

Change Log

2010-12-11: 1.9.3
- Handle swimming mount [Sea Turtle]
- When swimming on the surface of the water, Holding Shift while calling /mount best will try a flying mount instead of a swimming mount

2010-12-11: 1.9.2
- Handle Vashj'ir's swimming, land and flying mount areas better.
- Change logic back to avoid error messages

2010-12-09: 1.9.1
- Don't always choose Celestial Steed when you don't know flying

2010-12-08: 1.9.0
- Update for Cataclysm's mount speed handling.
- Added more Wrath endgame mounts
- Added support for Abyssal Seahorse in Vashj'ir