Easy activity tracking for models - similar to Github's Public Activity
Full Changelog: https://github.com/public-activity/public_activity/compare/v2.0.2...v3.0.0
Full Changelog: https://github.com/public-activity/public_activity/compare/v2.0.1...v2.0.2
Full Changelog: https://github.com/public-activity/public_activity/compare/v2.0.0...v2.0.1
create_activity!
method which raises exception on failures, much like save!
in ActiveRecord (see #334, thanks to Jonathan)