Updated DM in all docs

In DM: Fixed Capitalization, Added Item Queue, Service Queue, Matched
terms to those in the Report Glossary.
In Report: Updated Domain Model Diagram, removed "Adding deleting and
confirming reservations" from page 17 as it was crossed out
In Powerpoint: Removed Main Success Senario Slides as they were replaced
by the Basic Idea Slides, Updated Domain Model