Missing method and argument count errors

[khash]

Following the exact installation flow in readme, the first error you'd encounter is undefined method 'subscribe!' for OnboardingDripper:Class (NoMethodError) when OnboardingDripper.subscribe!(self) is called (inside ::User). Looking at ApplicationDripper I can't see any subscribe! methods, but only subscribe.

After changing subscribe! to subscribe, you'd get a undefined method onboarding_completed?'error on::User`

(which is clearly not defined in the app but there is no mention in the docs that it should, or shouldn't be defined, so you can imagine that it can be added to the 'User` class by the gem based on the campaign name)

The view helpers (unsubscribe URL, etc) also don't work as described, since they require arguments that are not passed by the mailer.

I have tried making various changes to make this work, based on that I can't see anyone else having such fundamental issues with the gem and therefore assumed it's something stupid I'm doing, with no luck.