corrected dci number field on the users/new page from a password field to text field
added sessions controller and corresopnding actions/routes (new create destroy)
added log in form to sessios/new view. Added create and destroy methods for sessions controller
added flash notice for unsucessful login to sessions controller. Also added flash method in layouts/application.html.erb
added 'signed in as', 'login' and ' sign up' to the application view. corrected the create action in the user controller to properly convert user_id to string...for mongodb compatibility
switched flash notices in application.html for aestetic purposes