PostStatusService can attach media to status, ProcessFeedService likewise

app/assets/stylesheets/api/media.scss

app/controllers/api/statuses_controller.rb

app/controllers/statuses_controller.rb

app/helpers/statuses_helper.rb

app/models/media_attachment.rb

app/services/post_status_service.rb

app/services/process_feed_service.rb

config/routes.rb

spec/controllers/statuses_controller_spec.rb

spec/helpers/api/accounts/lookup_helper_spec.rb

spec/helpers/api/media_helper_spec.rb

spec/helpers/statuses_helper_spec.rb