Page titles should be unique and descriptive #1441

New login workflow changes (post-shibboleth authentication) ...

- New dual choice layout in app/views/devise/registrations/new.html.erb
- Changes to omniauth_callbacks/application/registrations/sessions controllers to support choice post-shibboleth auth:
  - Do you have an account? Sign in to link your shibboleth credentials
  - If you don't have an account, sign up and this will link your shibboleth credentials
- Changes to sign in, create account, and password details forms for multiple onscreen "show password" tickboxes
- Aesthetic change to clear-field (X) icon (align it with input field and bring it inside)

Updated tests.

removed test that checks fastgettext locale value after sign_in. Having trouble testing Fastgettext in the application_controller test as well.

finished functional tests DMPRoadmap/roadmap/#212