Track related fixes

Make the message in admin/Tracks form more visible by making it bold and
adding links to venue and rooms
Make papertrail track changes for all the track's attributes
Add validation to require presence of description for self-organized
tracks
Add ID column to admin/Tracks#index
Make the cfp inclusion column sortable
Show success/error flash messages after toggling cfp inclusion

app/views/admin/tracks/index.html.haml

@@ -1,3 +1,4 @@
+.unobtrusive-flash-container
 .row
   .col-md-12
     .page-header
@@ -8,6 +9,7 @@
   .col-md-12
     %table.table.table-hover.table-striped.table-bordered.datatable#tracks
       %thead
+        %th ID
         %th Name
         %th Description
         %th Room
@@ -20,6 +22,8 @@
       %tbody
         - @tracks.each do |track|
           %tr
+            %td
+              = track.id
             %td{style: "padding: 15px 0px 0px 10px;"}
               = link_to admin_conference_program_track_path(@conference.short_title, track), class: 'btn' do
                 %span.label{style: "background-color: #{track.color}; color: #{ contrast_color(track.color) }"}
@@ -35,7 +39,7 @@
               = track.end_date.strftime('%A, %B %-d. %Y') if track.end_date
             %td
               = link_to track.submitter.name, admin_user_path(track.submitter) if track.self_organized?
-            %td.text-center
+            %td.text-center{ 'id' => "cfp_switch_#{track.id}", 'data-order' => track.cfp_active.to_s }
               = check_box_tag "#{@conference.short_title}_#{track.short_name}", track.id, track.cfp_active,
                 class: 'switch-checkbox', method: :patch,
                 url: toggle_cfp_inclusion_admin_conference_program_track_path(@conference.short_title, id: track.short_name)+"?included=",