Merge branch 'master' into fix-mp4

app/controllers/concerns/paginator.rb

app/controllers/v1/learning_objects/attachment_controller.rb

app/controllers/v1/learning_objects_controller.rb

app/controllers/v1/search_controller.rb

app/policies/learning_object_policy.rb

app/services/search_service/model.rb

app/services/tag_search_service.rb

app/workers/attachment_cache_worker.rb

config/routes.rb

...808132744_add_info_hash_to_learning_object_attachments.rb

lib/tasks/learning_objects_tags.txt

lib/tasks/tag_clustering.rake

lib/tasks/tag_search_aquecimento_global.txt

lib/tasks/tag_search_corrosao.txt

lib/tasks/tag_search_dna.txt

lib/tasks/tag_search_forca_gravitacional.txt

lib/tasks/tag_search_sagitario.txt

lib/tasks/tags.ftree

lib/tasks/tags.net

spec/acceptance/learning_objects_spec.rb