delete all helper classes

app/helpers/about_helper.rb

app/helpers/application_helper.rb

app/helpers/bookmarks_helper.rb

app/helpers/collections_helper.rb

app/helpers/feedback_helper.rb

app/helpers/learning_objects/builder_helper.rb

app/helpers/learning_objects_helper.rb

app/helpers/links_helper.rb

app/helpers/management/carousel_helper.rb

app/helpers/management/object_types_helper.rb

app/helpers/management/users_helper.rb

app/helpers/management/welcome_helper.rb

app/helpers/search/solr_helper.rb

app/helpers/users_helper.rb

app/helpers/welcome_helper.rb