Minor corrections in setup process

Hi

It's a really basic pull request, but it resolves some bugs and errors I faced during setup process.
Also, I've added a URL for 'password_reset_done', because it was missing and raise an error on Unisson when you click on '[mot de passe oublié](http://unisson.co/account/password/reset/)', from [signin](http://unisson.co/signin/) page.