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/venues/_form.html.haml

@@ -1,8 +1,14 @@
-= semantic_form_for(@venue, url: admin_conference_venue_path(@conference.short_title)) do |f|
-  = f.inputs :name, :website
-  = f.input :description, input_html: { rows: 5, cols: 20, data: { provide: 'markdown-editable' } }, hint: markdown_hint
-  = f.inputs :street, :postalcode, :city, :country, :longitude, :latitude
-  - unless @venue.photo.blank?
-    = image_tag @venue.photo(:thumb)
-  = f.input :photo
-  = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+.row
+  .col-md-12
+    .page-header
+      %h1 Venue
+.row
+  .col-md-8
+    = semantic_form_for(@venue, url: admin_conference_venue_path(@conference.short_title)) do |f|
+      = f.inputs :name, :website
+      = f.input :description, input_html: { rows: 5, cols: 20, data: { provide: 'markdown-editable' } }, hint: markdown_hint
+      = f.inputs :street, :postalcode, :city, :country, :longitude, :latitude
+      - unless @venue.photo.blank?
+        = image_tag @venue.photo(:thumb)
+      = f.input :photo
+      = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }

app/views/admin/venues/show.html.haml

@@ -1,3 +1,9 @@
+.row
+  .col-md-12
+    .page-header
+      %h1 Venue
+      %p.text-muted
+        The place where your conference takes place
 -if @venue
   .row
     .col-md-6
@@ -20,6 +26,6 @@
         Delete Venue
 -else
   .row
-    .col-md-12
-      = link_to(new_admin_conference_venue_path(@conference.short_title), class: 'btn btn-success') do
+    .col-md-12.text-right
+      = link_to(new_admin_conference_venue_path(@conference.short_title), class: 'btn btn-primary') do
         Create Venue