Public schedule adapted to the new relations

Public schedule and all events adapted to the new relations and models to allow having several schedules in the admin shcedule.

app/controllers/proposal_controller.rb

@@ -15,6 +15,7 @@ class ProposalController < ApplicationController
   def show
     # FIXME: We should show more than the first speaker
     @speaker = @event.speakers.first || @event.submitter
+    @event_schedule = @event.selected_event_schedule
   end
 
   def new