Adds splash component checkboxes to admin dashboard

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

@@ -1,5 +1,6 @@
 .row
   .col-md-8
     = semantic_form_for(@conference, :url => admin_conference_track_path(@conference.short_title, @conference.tracks)) do |f|
+      = f.input :include_tracks_in_splash, hint: 'On setting this true you will enable the tracks to be displayed on the splash page'
       = dynamic_association :tracks, "Tracks", f
       = f.action :submit, :as => :button, :button_html => {:class => "btn btn-primary"}