Added UsersController, CreateUsers Migration, PagesController, some views and bootstrap_form gem.
Created user/new.html.haml and edited CreateUsers migration.
Added sign in and registration functionality.
Added tests for user model, added helpers for authentication.
Some code cleanup based on solutions.
Added custom test for "validate_uniqueness_of \:email" to fix issue with password_confirmation"
Added test for presence of "password_confirmation"
Some changes made following suggestions from pull request in the UsersCOntroller. Added redirection to new User action if already logged in.