close #312; Fix RSpec 'with_versioning' class helper method
close #334; Add small-scope 'whodunnit' method to PaperTrail::Model::InstanceMethods
Update "Has-One Associations" section in README [ci skip]
Fix PaperTrail initializer for setting console author [ci skip]

Without that change the initializer does not work.
It tries to find PaperTrail::Rails::Console
instead of Rails::Console
Merge remote-tracking branch 'kiela/master' [ci skip]
Clarify README instructions for usage of ProtectedAttributes with metadata [ci skip]
Refactor instructions for initializer to automatically defer whodunnit value from shell [ci skip]
Code condensation; 'without_versioning' method now yields model instance
Adjust language in README for abstract class declaration; rename key assignment appropriately for PaperTrail.enabled_for_model