Minor features/fixes

* Fix admin sub menus
* Show email address in people#index
* Add User Area link in navbar
* Smaller textareas on proposal#new so you don't have to scroll
* Counting of registrations, users and people
* Use datatables for users and people
* Show event type on admin/events#show

app/views/admin/registrations/show.pdf.prawn

@@ -28,11 +28,11 @@ prawn_document(:force_download=>true, :filename => @pdf_filename) do |pdf|
     else
       row << " "
     end
-    row << registration.arrival
-    row << registration.departure
+    row << registration.arrival.to_s
+    row << registration.departure.to_s
     table_array << row
   end
 
   pdf.text "#{@conference.title} Registrations", :font_size => 25
   pdf.table table_array, :header => true, :cell_style => {:size => 5, :border_width => 1}
-end
+end