Adding user sign-in/sign-up using Monban and added name field to user model

* Generating user authentication with Monban and Monban-Generator
* Adding routing constraints for when signed-in and when not
* Creating LandingsController and landings show view as root path when not
* signed in
Fixing formatting by deleting extra lines
Merge pull request #1 from Psychologist-Today/create_sign_in

Adding user authentication using Monban and name field to user model