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/conference/show.html.haml

@@ -33,9 +33,9 @@
       %section#program
         = render 'program'
 
-    - if @conference.cfp_open? and @conference.call_for_papers.include_cfp_in_splash?
+    - if @conference.cfp_open? and @conference.call_for_paper.include_cfp_in_splash?
       %section#callforpapers
-        = render 'call_for_papers'
+        = render 'call_for_paper'
 
     - if @conference.venue and @conference.splashpage.include_venue
       %section#venue
@@ -70,4 +70,4 @@
         var pattern = t.generate(document.body.clientWidth, ($( "#banner" ).height() + 200 ));
         $('#banner').css('background-image', pattern.dataUrl);
       });
-    });
+    });