Several schedules in the backend && routes changed

- Introduce plural resources for Schedule in routes.rb
- Introduce #index and #create actions for ScheduleController
- Make it possible to set a schedule as selected_schedule

app/views/admin/schedule/show.html.haml

@@ -0,0 +1,34 @@
+.row
+  .col-md-12
+    .page-header
+      %h1 Schedule
+      %p.text-muted
+        Create the schedules for the conference
+
+.row
+  .col-md-2
+    Selected schedule
+    = check_box_tag @conference.short_title, @schedule_id, (@schedule_id == @selected_schedule_id),
+      method: :put, url: "/admin/conference/#{@conference.short_title}/schedule/#{@schedule_id}?selected_schedule=",
+      class: 'switch-checkbox', data: { size: 'small',
+                                        off_color: 'warning',
+                                        on_text: 'Yes',
+                                        off_text: 'No' }
+    .h4
+      Unscheduled events
+    .unscheduled-events
+  .col-md-10
+    %ul.nav.nav-tabs
+      - @dates.each do |date|
+        %li{ class: "#{ (@dates.first == date) ? 'active' : '' }"}
+          %a{ href: "##{date}" }
+            = date
+    .tab-content
+      - @dates.each do |date|
+        .tab-pane{ class: "#{ (@dates.first == date) ? 'active' : '' }", id: "#{date}" }
+          = render partial: 'day_tab', locals: { date: date }
+
+:javascript
+  $(document).ready( function() {
+    Schedule.loadEvents("#{@conference.short_title}", "#{@schedule_id}");
+  });