Sort Tours by first Tourday

[robsteiger]

bitte sortieren nach dem ersten tag der tour aufsteigend

[andylatte]

tour

• update_start_date (new method)

migration

• add start_date date to tour
• call update_start_date on each tour

after_save tour_day

• self.tour.update_start_date if self.date < self.tour.start_date

after_destroy tour_day

• self.tour.update_start_date