Do not use JS to initialize the schedule

- Only use JS for the drag&drop functionality and to the set/alter the time and rooms of the EventSchedule object.

- Introduce has_many :events, through: :event_schedules association to get unscheduled event easily

spec/models/schedule_spec.rb

@@ -5,5 +5,6 @@ describe Schedule do
   describe 'association' do
     it { should belong_to(:program) }
     it { should have_many(:event_schedules).dependent(:destroy) }
+    it { should have_many(:events).through(:event_schedules) }
   end
 end