Add callback for password changes

[reedloden]

I'd like to perform certain actions on a successful password change. A callback would be nice. There's after_password_reset, but that's been deprecated and doesn't cover all my use cases anyway.

[josevalim]

You can do this in two ways:

1. Have a before_save callback that checks if the encrypted password changed and work based on that
2. Override reset_password in your model and call super in there

[rcanand]

I overrode reset_password in my user model, but a byebug in that method does not hit when I reset the password from registrations/edit page.