* Add new columns to notifications table
* Remove stream from notifications and add new methods
* Turn off moderation comment notifications
* Add notifiable_type index to migration
* Stop creation of Stream-based notification model instances
* Add notification model create hooks
* Add badge achievement notification creation hook
* Fix some specs
* Add missing @ symbol
* Fix for tests and rename a few things
* forgot to uncomment code sigh
* Modify sample_application.yml and write test
* Add ahrefs verification
* Add some tests around model validations
* Indent an end
* Add a few tests
* Add tests and reserved words
* Fix live articles spec typo
* Modify ga_events_controller
