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/contacts/edit.html.haml

@@ -1,16 +1,19 @@
 .row
   .col-md-12
-    %ul.nav.nav-tabs{'role'=>'tablist'}
-      %li.active
-        %a{'href'=> '#show', 'role'=>'tab', 'data-toggle'=>'tab'}
-          Show
-      %li
-        %a{'href'=> '#edit', 'role'=>'tab', 'data-toggle'=>'tab'}
-          Edit
+    .page-header
+      %h1 Contact
+      %p.text-muted
+        How people can contact you
 .row
-  .col-md-12
-    .tab-content
-      .tab-pane.active#show
-        = render partial: 'show'
-      .tab-pane#edit
-        = render partial: 'form'
+  .col-md-8
+    = semantic_form_for(@contact, :url => admin_conference_contact_path(@conference.short_title),:html => {:multipart => true}) do |f|
+      = f.inputs :name => 'Mail' do
+        = f.input :email, hint: 'Contact email address for your conference. Will be used as reply-to address in emails sent out by the system.'
+        = f.input :sponsor_email, hint: 'This will appear in the sponsor segment of the splash for the sponsors to contact to the organizers'
+      = f.inputs :name => 'Social Media' do
+        = f.input :social_tag, hint: "The hashtag you'll use on Twitter and Google+. Don't include the '#' sign!'"
+        = f.input :facebook, hint: 'This will appear in the social media section as link to the Facebook page of your Conference'
+        = f.input :googleplus, label: 'Google+ Url', hint: 'This will appear in the social media section as the link to the Google+ Page of your Conference'
+        = f.input :twitter, hint: 'This will appear in the social media section as the link to the Twitter Page of your Conference'
+        = f.input :instagram, hint: 'This will appear in the social media section as the link to the Instagram Page of your Conference'
+      = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }