Added id as parameter for editing a listing. Added basic security for edit/add listing.
Moved .xhtml files in separate folders in order to apply security rules.
Changed the database from hsqldb to postgresql.
Changed authentication manager - replaced hard coded users with users
from the database.
Added service for operations with the User bean.
Implemented UserDetailsService interface to retrieve users from the
database.
Set submitDate and owner for a listing.
Added DAO class for User.
Added User and Role classes for authentication from the DB.
Added new field for storing the owner of the listing.
Small refactorings.
Added information about logged in user and "Remember me" functionality.
Changed database structure, added insert statements for tables.
Updated .gitignore.
Merge pull request #1 from beatrik/master

Implemented security.