Merge Addlogin branch

I generated Devise views, added a pages controller, set the root_path and after_sign_in_path, and added authentication to the application controller.

Until we have seed data each user will need to create their own login info with the following rails console command (obviously replacing email and password):
@user = Caseworker.create!(:email => 'email', :password => 'password', :password_confirmation  => 'password')