Merge release 1.6.5

VERSION

arkindex/documents/fixtures/data.json

arkindex/documents/management/commands/build_fixtures.py

arkindex/documents/management/commands/gunicorn.py

arkindex/documents/tests/test_bulk_classification.py

arkindex/documents/tests/test_bulk_element_transcriptions.py

arkindex/documents/tests/test_bulk_elements.py

arkindex/documents/tests/test_bulk_transcription_entities.py

arkindex/documents/tests/test_bulk_transcriptions.py

arkindex/documents/tests/test_classification.py

arkindex/documents/tests/test_create_elements.py

arkindex/documents/tests/test_create_transcriptions.py

arkindex/documents/tests/test_entities_api.py

arkindex/documents/tests/test_metadata.py

arkindex/documents/tests/test_retrieve_elements.py

arkindex/images/tests/test_image_api.py

arkindex/metrics/tests/test_metrics_api.py

arkindex/ponos/migrations/0011_agent_accept_tasks.py

arkindex/ponos/models.py

arkindex/ponos/tests/rq/test_trigger.py