Develop

See merge request !2

added logo, collapsible navbar,

added font-awesome
updated heading to display current cart total.

- bootstrap enabled on header and footer

- Changed display so that login/logout links only offered when appropriate

successful registration.

UserRepository:  updated to include findByLoginId method.
register.jsp:  updated to include inputs bound to UserRegistrationForm.
MainController:  added 'processRegistration' method, which takes values
from the UserRegistrationForm and adds a user to the database.
application.properties:  commented out ddl-auto property.