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/lodgings/_form.html.haml

@@ -1,8 +1,19 @@
-= semantic_form_for(@lodging, :url => (@lodging.new_record? ? admin_conference_lodgings_path : admin_conference_lodging_path(@conference.short_title, @lodging))) do |f|
-  = f.input :name
-  = f.input :website_link
-  = f.input :description, input_html: { rows: 5, cols: 20, data: { provide: 'markdown-editable' } }, hint: markdown_hint
-  - unless @lodging.photo.blank?
-    = image_tag @lodging.photo(:thumb)
-  = f.input :photo
-  = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+.row
+  .col-md-12
+    .page-header
+      %h1
+        - if @lodging.new_record?
+          New
+        Lodging
+        = @lodging.name
+.row
+  .col-md-8
+    = semantic_form_for(@lodging, :url => (@lodging.new_record? ? admin_conference_lodgings_path : admin_conference_lodging_path(@conference.short_title, @lodging))) do |f|
+      = f.input :name
+      = f.input :website_link
+      = f.input :description, input_html: { rows: 5, cols: 20, data: { provide: 'markdown-editable' } }, hint: markdown_hint
+      - unless @lodging.photo.blank?
+        = image_tag @lodging.photo(:thumb)
+      = f.input :photo
+      %p.text-right
+        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }