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

spec/views/admin/call_for_papers/show.html.haml_spec.rb

@@ -0,0 +1,13 @@
+require 'spec_helper'
+
+describe 'admin/call_for_papers/show' do
+
+  it 'renders call for papers details' do
+    assign :conference, create(:conference)
+    assign :call_for_paper, create(:call_for_paper)
+    render
+    expect(rendered).to include(1.day.ago.strftime('%A, %B %-d. %Y'))
+    expect(rendered).to include(7.days.from_now.strftime('%A, %B %-d. %Y'))
+  end
+
+end