ZVISION: Added detection for Zork Grand Inquisitor English Demo.
ZVISION: Added detection for Zork Nemesis English Demo.
ZVISION: Added detection for Zork Grand Inquisitor English DVD version.
Merge pull request #1 from khbecker/zvision

ZVISION: Add detection for Zork Nemesis and Zork Grand Inquisitor demos and Zork Grand Inquisitor DVD version