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/sponsorship_levels/_form.html.haml

@@ -1,2 +1,14 @@
-= f.input :title
-= f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+.row
+  .col-md-12
+    .page-header
+      %h1
+        - if @sponsorship_level.new_record?
+          New
+        Sponsorship Level
+        = @sponsorship_level.title
+.row
+  .col-md-8
+    = semantic_form_for(@sponsorship_level, :url => (@sponsorship_level.new_record? ? admin_conference_sponsorship_levels_path : admin_conference_sponsorship_level_path(@conference.short_title, @sponsorship_level))) do |f|
+      = f.input :title
+      %p.text-right
+        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }

app/views/admin/sponsorship_levels/edit.html.haml

@@ -1,8 +0,0 @@
-%h1 Editing Sponsorship Level
-
-.row
-  .col-md-8
-    = semantic_form_for @sponsorship_level, url: admin_conference_sponsorship_level_path(conference_id: @conference.short_title, id: @sponsorship_level.id) do |f|
-      = render 'form', f: f
-
-= link_to 'Back', admin_conference_sponsorship_levels_path

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

@@ -1,9 +1,13 @@
-%h1 Sponsorship Levels
-
+.row
+  .col-md-12
+    .page-header
+      %h1 Sponsorship Levels
+      %p.text-muted
+        Classify your sponsors
 - if @conference.sponsorship_levels.any?
   .row
     .col-md-12
-      %table.table#sponsorship_levels
+      %table.table.table-hover#sponsorship_levels
         %thead
           %th Title
           %th Position
@@ -25,5 +29,6 @@
                 method: :get, class: 'btn btn-primary'
                 = link_to 'Delete', admin_conference_sponsorship_level_path(@conference.short_title, sponsorship_level.id),
                 method: :delete, class: 'btn btn-danger', data: { confirm: "Do you really want to delete the sponsorship level #{sponsorship_level.title}?" }
-
-= link_to 'New Sponsorship Level', new_admin_conference_sponsorship_level_path(@conference.short_title), class: 'btn btn-success'
+.row
+  .col-md-12
+    = link_to 'New Sponsorship Level', new_admin_conference_sponsorship_level_path(@conference.short_title), class: 'btn btn-success pull-right'

app/views/admin/sponsorship_levels/new.html.haml

@@ -1,7 +0,0 @@
-%h1 New Sponsorship Level
-.row
-  .col-md-8
-    = semantic_form_for @sponsorship_level, url: admin_conference_sponsorship_levels_path(conference_id: @conference.short_title) do |f|
-      = render 'form', f: f
-
-= link_to 'Back', admin_conference_sponsorship_levels_path