Implement consistent admin interface

* Consistent route/model/controller/view layout
* Get rid of unused photos, speakers, dietchoices, social_events controllers
* Drop unused :public from Rooms and :description from CallForPapers

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

@@ -1,38 +1,35 @@
-%h1 Tickets
-%p.lead
-  If you add Tickets to your Conference, people will be redirected after registration to a page where they can purchase tickets.
+.row
+  .col-md-12
+    .page-header
+      %h1 Tickets
+      %p.text-muted
+        Tickets to purchase during registration
 - if @conference.tickets.any?
   .row
     .col-md-12
-      %table.table
+      %table.table.table-hover#tickets
         %thead
-          %th #
           %th Title
           %th Price
-          %th Buyer
-          %th Show
-          %th Edit
-          %th Delete
+          %th Sold
+          %th Actions
         %tbody
-          - @conference.tickets.each_with_index do |ticket, index|
+          - @conference.tickets.each do |ticket|
             %tr
               %td
-                = index + 1
-              %td
-                = ticket.title
+                = link_to(admin_conference_ticket_path(@conference.short_title, ticket.id)) do
+                  = ticket.title
               %td
                 = humanized_money_with_symbol ticket.price
               %td
                 = ticket.buyers.count
               %td
-                = link_to 'Show', admin_conference_ticket_path(@conference.short_title, ticket.id),
-                method: :get, class: 'btn btn-success'
-              %td
-                = link_to 'Edit', edit_admin_conference_ticket_path(@conference.short_title, ticket.id),
-                method: :get, class: 'btn btn-primary'
-              %td
-                = link_to 'Delete', admin_conference_ticket_path(@conference.short_title, ticket.id),
-                method: :delete, class: 'btn btn-danger', data: { confirm: "Do you really want to delete the Ticket for #{ticket.title}?" }
-
-= link_to 'Add Ticket', new_admin_conference_ticket_path, class: 'btn btn-success'
+                .btn-group
+                  = link_to 'Edit', edit_admin_conference_ticket_path(@conference.short_title, ticket.id),
+                  method: :get, class: 'btn btn-primary'
+                  = link_to 'Delete', admin_conference_ticket_path(@conference.short_title, ticket.id),
+                  method: :delete, class: 'btn btn-danger', data: { confirm: "Do you really want to delete the Ticket for #{ticket.title}?" }
+.row
+  .col-md-12
+    = link_to 'Add Ticket', new_admin_conference_ticket_path, class: 'btn btn-success pull-right'