Install devise.
Use Figaro for secret management.
Set Devise email sender to noreply@graspapp.io
Remove tests directory.
Remove unused specs.
Install Factory Girl.
Create devise user model.
Add student model.
Student account creation and logging in is a go.
Implement teacher authentication and improve auth flow backend.
Update all the gems.
Remove devise error message overriding.
Remove information comment at top of Guardfile.
Vastly improve Devise views.
Create macros for student and teacher logging in.
Use STI instead of polymorphic inheritance for user models.
Enforce available locales.