Initial release

1. User can register
2. User can login.
   Logins are tracked using sessions and destroyed when user logins.
3. User can Logout
4. User can view the catalog without login
5. User can add items to his cart, once he/she login's
6. User can view his cart, once he/she login's
7. User can remove a cart item from his/her cart
8. User can view the number of cart items on navbar once he/she login's without going to cart page