deleting old controllers

app/controllers/old/about_controller.rb

app/controllers/old/bookmarks_controller.rb

app/controllers/old/callbacks_controller.rb

app/controllers/old/chunks_controller.rb

app/controllers/old/collections_controller.rb

app/controllers/old/complaints_controller.rb

app/controllers/old/feedbacks_controller.rb

app/controllers/old/institutions_controller.rb

app/controllers/old/learning_objects/build_controller.rb

app/controllers/old/learning_objects_controller.rb

app/controllers/old/links_controller.rb

app/controllers/old/reviews_controller.rb

app/controllers/old/search_controller.rb

app/controllers/old/users_controller.rb

app/controllers/old/welcome_controller.rb