admins: remove ability to manually process BURs.

Remove the ability for admins to manually submit BURs without going
through the forum.

config/routes.rb

@@ -1,7 +1,6 @@
 Rails.application.routes.draw do
   namespace :admin do
     resources :users, :only => [:edit, :update]
-    resource  :alias_and_implication_import, :only => [:new, :create]
     resource  :dashboard, :only => [:show]
   end
   namespace :moderator do