UI/UX changes related to tracks

Add confirmed and cfp_active scopes to Track
Render markdown in track's description
Make the views more similar to the proposal/events views
Change the sequence of columns in admin/Tracks#index
Remove the short_name column from the index views
Add button "My Tracks" in the user menu
Fix track count in proposals
Add details of track in admin/Tracks#show
Use tabs to show track details and events

app/views/tracks/show.html.haml

@@ -2,9 +2,12 @@
   .row
     .col-md-12
       .page-header
-        %h1
+        %h2
           = @track.name
           Track
+          .btn-group.pull-right
+            - if can? :edit, @track
+              = link_to 'Edit Track request', edit_conference_program_track_path(@conference.short_title, @track), class: 'btn btn-primary'
   .row
     .col-md-8
       %dl.dl-horizontal
@@ -16,26 +19,23 @@
         %dt
           State:
         %dd
-          = @track.state.humanize
+          - if %w(new to_accept to_reject).include? @track.state
+            New
+          - else
+            = @track.state.humanize
         %dt
           Start date:
         %dd
-          - if @track.start_date
-            = @track.start_date.strftime('%A, %B %-d. %Y')
-          - else
-            N/A
+          = @track.start_date.strftime('%A, %B %-d. %Y') if @track.start_date
         %dt
           End date:
         %dd
-          - if @track.end_date
-            = @track.end_date.strftime('%A, %B %-d. %Y')
-          - else
-            N/A
+          = @track.end_date.strftime('%A, %B %-d. %Y') if @track.end_date
+        %dt
+          Room:
+        %dd
+          = @track.room.try(:name)
         %dt
           Description
         %dd
-          = @track.description
-  .row
-    .col-md-12.text-right
-      - if can? :edit, @track
-        = link_to 'Edit Track request', edit_conference_program_track_path(@conference.short_title, @track), class: 'btn btn-primary'
+          = markdown(@track.description)