Altered Logins, Added Login Actions

Altered the logins for User and Administrator classes, altered the
format of the login.jsp page, and added functionality in
login_action.jsp
Added error message to login.jsp

If an error occurs during login, and error message will be displayed on
the front page.
Added admin and user portals

Added pages for the admin and user portal where the menu options for the
user and admin will end up being displayed.