Added devise for authentication

 	modified:   Gemfile
 	modified:   app/controllers/photos_controller.rb
 	modified:   app/models/photo.rb
 	new file:   app/models/user.rb
 	new file:   app/views/devise/confirmations/new.html.erb
 	new file:   app/views/devise/mailer/confirmation_instructions.html.erb
 	new file:   app/views/devise/mailer/reset_password_instructions.html.erb
 	new file:   app/views/devise/mailer/unlock_instructions.html.erb
 	new file:   app/views/devise/passwords/edit.html.erb
 	new file:   app/views/devise/passwords/new.html.erb
 	new file:   app/views/devise/registrations/edit.html.erb
 	new file:   app/views/devise/registrations/new.html.erb
 	new file:   app/views/devise/sessions/new.html.erb
 	new file:   app/views/devise/shared/_links.erb
 	new file:   app/views/devise/unlocks/new.html.erb
 	modified:   app/views/layouts/application.html.erb
 	new file:   config/initializers/devise.rb
 	new file:   config/locales/devise.en.yml
 	modified:   config/routes.rb
 	new file:   db/migrate/20131127074130_devise_create_users.rb
 	modified:   db/schema.rb
 	new file:   test/fixtures/users.yml
 	new file:   test/fixtures/views.yml
 	new file:   test/unit/user_test.rb
 	new file:   test/unit/view_test.rb