Updated items list & added DB query for login

Added all of the item types and changed index.jsp to show changes in
InitializeParameters servlet.  Cannot get icon images to show on
index.jsp.  Added servlets and .class files to query database for user
login info.
Changed User.java to UserValidation.java

This file was not needed as we had a User.java class in the utilities
folder.  Repurposed this class to assist in user login validation.