Added monban functionality to Listrr

* Guests can sign up and sign in with their email
* Used monban-generators gem to add authentication components
* Made monban-recommended changes to layout and routes files
Completed addition of monban functionality to Listrr

* Added Dashboards Controller
* Added Dashboards show view
* Signed-out user is redirected to new session page
Removed whitespace from end of users and sessions controllers
Merge pull request #1 from AthenasWarriors/ad-monban-stuff

Added monban functionality to Listrr