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/targets/_form.html.haml

@@ -0,0 +1,15 @@
+.row
+  .col-md-12
+    .page-header
+      %h1
+        -if @target.new_record?
+          New
+        Target
+.row
+  .col-md-8
+    = semantic_form_for(@target, :url => (@target.new_record? ? admin_conference_targets_path : admin_conference_target_path(@conference.short_title, @target))) do |f|
+      = f.input :due_date, as: :string, input_html: { class: 'target-due-date-datepicker'}, label: 'Until when do you want to have '
+      = f.input :target_count, label: 'this amount of '
+      = f.input :unit, as: :select, label: 'Unit', class: 'form-control', collection: Target.units.values, include_blank: false, label: 'units '
+      %p.text-right
+        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }

app/views/admin/targets/_target_fields.html.haml

@@ -1,6 +0,0 @@
-.nested-fields
-  = f.inputs do
-    = f.input :due_date, as: :string, input_html: { class: 'target-due-date-datepicker', readonly: 'readonly' }
-    = f.input :target_count
-    = f.input :unit, as: :select, label: 'Unit', class: 'form-control', collection: Target.units.values, include_blank: false
-    = remove_association_link :target, f

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

@@ -1,5 +1,35 @@
 .row
-  .col-md-8
-    = semantic_form_for(@conference, url: admin_conference_target_path(@conference.short_title, @conference.targets)) do |f|
-      = dynamic_association :targets, 'Targets', f
-      = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+  .col-md-12
+    .page-header
+      %h1 Targets
+      %p.text-muted
+        Set up goals for your conference
+.row
+  .col-md-12
+    %table.table.table-hover#targets
+      %thead
+        %tr
+          %th Due Date
+          %th Target Count
+          %th Unit
+          %th Actions
+      %tbody
+        - @targets.each do |target|
+          %tr
+            %td{'id'=> "due_date_#{target.id}"}
+              = target.due_date
+            %td{'id'=> "count#{target.id}"}
+              = target.target_count
+            %td{'id'=> "unit_#{target.id}"}
+              = target.unit
+            %td
+              .btn-group
+                = link_to 'Edit',
+                edit_admin_conference_target_path(@conference.short_title, target.id),
+                class: 'btn btn-primary'
+                = link_to 'Delete',
+                admin_conference_target_path(@conference.short_title, target.id),
+                method: :delete, class: 'btn btn-danger', data: { confirm: "Do you really want to delete this target?" }
+.row
+  .col-md-12
+    = link_to 'New Target', new_admin_conference_target_path, class: 'btn btn-success pull-right'