Adds splash component checkboxes to admin dashboard

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

@@ -2,5 +2,6 @@
   .col-md-8
     = semantic_form_for(@conference, :url => admin_conference_supporter_level_path(@conference.short_title, @conference.supporter_levels)) do |f|
       = f.input :use_supporter_levels, :label => false
+      = f.input :include_tickets_in_splash, hint: 'On setting this true you will enable the tickets to be displayed on the splash page'
       = dynamic_association :supporter_levels, "Supporter Levels", f
       = f.action :submit, :as => :button, :button_html => {:class => "btn btn-primary"}