scambra/devise_invitable — pull request #271 by strzalek (2013-01-29 14:44:25+00:00)
Title: Remove changing password_salt field

There's no password_salt since devise 1.2.1:

"Devise 1.2.1 does not require a password_salt column anymore if you
are using bcrypt. If you need a kind of salt, I believe there is a
method called authentication_salt you could use to retrieve such
values." ~ Jose Valim (https://groups.google.com/d/msg/plataformatec-devise/saHGSLwm5U0/GCQ1PkOh8AUJ)