#DONE
blog para la tutoria de ruby
blog users/new (creo que es el sign up)
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user sccaffold (email, password) new#sign_up
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solo un controller SessionsController (new (formulario para sign in, email, password), create (sign in, comprobar usuario y password), delete (log out))
para logear
session[:user_id] = @user.id
para deslogear
session[:user_id] = nil
###TODO:
correct routes