Concerns

[johannesschobel]

Dear @lazaronixon ,

thank you very much for this awesome library - i use it as replacement for "devise", and i really (!) like it.
However, i stumbled upon some issues, with respect to maintainability of my own code, when updating your library.

Every time i run rails g authentication --with-some-custom-arguments, my user.rb model is updated (i.e., all my changes are lost). I then need to manually accept / reject changes via console (i.e., to restore my previous functionality and add the required new features).

Therefore, i propose to move everything related to authentication-zero that is now within the User model (within app/models/user.rb) to a dedicated Authenticable concern (within app/models/concerns/authenticable.rb) and just include Authenticable in the User model.

I guess, i could do a PR, if you want - however, you may need to assist me, how to get your project running and tell me how i can test my changes.

All the best and thank you very much for your effort,
Johannes

This is similar to #106