Event already has author relation
Merge pull request #3034 from Andrew8xx8/patch-2

Event already has author relation
Add state machine gem
Add base of Event base
Add base of Notifications
Subscription base
Add notofication state to notifications
Replace Event class with OldEvent class
replace events with old_events
Add new relations with new events system
fix errors
fix Notification model
db schema after migration
Enumerize gem added
Classes renamed
Actionable added
Actionable added
Event factory added
Notification service added
ActivityObserver moved to old