Core Cleanup: Day 3

I've added pod to the remainder of the schema classes and to the bulk of the object classes. I still have to do pod for the Cart/Object/Item object classes and make sure I pass the usual pod spelling/syntax/coverage tests.

After that, I'm on to test coverage and filling in any little API gaps. User profiles need more fields like email and stuff. I've only did first name/last name just to get it all rolling. I also need to either figure out the schema to support sales, or just drop the feature until 1.0.

At this rate, I think I'm still on target for a release to CPAN next week with just the Core (Schema/Provider/Object) classes.