* When adding an exact birthdate for a contact, a significant other or a kid, a reminder is now automatically created.
* When editing this date, the reminder will be automatically updated.
* When deleting the object, the associated reminder will be deleted.
* Fix birthdate data in production.
* Fix duplication of reminders when updating a contact.
* Add a new way of tracking birthdays in the reminders table.
Fix#325
* Edit relation docblocks of Contact model
* Move activities to its own controller
* Move reminders to its own controller
* Move tasks to its own controller
* Refactor Gift in preparation for the move
* Move gifts into its own controller
* Fix failing tests
* Move debt to its own controllelr
* Fix tests failing on PHP7
* Move significant others to its own controller
* Move kids to its own controller
* Move notes to its own controller
* Some more adjustments & solving #277
And more query optimizations
