Revert "Used Exceptions for Inventory"

This reverts commit 92a54661f099c802431c578f475e550fc0e7d60b.
Revert "Inventory currently broken, but re-added .classpath, this may not go"

This reverts commit cce9e8c26da5c124c1b2d46e1269081f73879b62.
Revert "Inventory currently broken, but re-added .classpath, this may not go"

This reverts commit cce9e8c26da5c124c1b2d46e1269081f73879b62.

Conflicts:
	src/helixprophets/items/Inventory.java