Pyvespa

* Improve output on deployment failure (https://github.com/vespa-engine/pyvespa/pull/326)
* Hard-code onnx model path separator to avoid misbehavior when using Windows. (https://github.com/vespa-engine/pyvespa/pull/328)
* Add `namespace` argument to document operations (https://github.com/vespa-engine/pyvespa/pull/337)
* Include evaluation example with `recall` argument (https://github.com/vespa-engine/pyvespa/pull/338)
* Introduce `vespa.experimental.ranking` module (https://github.com/vespa-engine/pyvespa/pull/336)

* Enable Docker deployment via a POST request (https://github.com/vespa-engine/pyvespa/pull/318)

* Enable Docker deployment without `disk_folder` specification through a zip file. (https://github.com/vespa-engine/pyvespa/pull/313, https://github.com/vespa-engine/pyvespa/pull/315)

* Use latest `transformer` library and `pipeline` class. (https://github.com/vespa-engine/pyvespa/pull/254)
* Make it possible to specify `container_image` when creating a `VespaDocker` instance.

* `app.query_batch`: Add method to send queries in batch (https://github.com/vespa-engine/pyvespa/pull/244)

* Add retry strategy to `delete_data`, `get_data` and `update_data` (https://github.com/vespa-engine/pyvespa/pull/222)
* Deployment parameter `disk_folder` defaults to the current working directory for both Docker and Cloud deployment (https://github.com/vespa-engine/pyvespa/pull/225)
* Vespa connection now accepts cert and key as separate arguments. Using both certificate and key values in the cert file continue to work as before. (https://github.com/vespa-engine/pyvespa/pull/226)