Pytd

-------------------

- Update documentation site. (`49 <https://github.com/treasure-data/pytd/pull/49>`__, `#57 <https://github.com/treasure-data/pytd/pull/57>`__)
- Add Treasure Data API endpoint HTTPS scheme validation. (`51 <https://github.com/treasure-data/pytd/pull/51>`__)
- Support bulk importing with the MessagePack format. (`53 <https://github.com/treasure-data/pytd/pull/53>`__)
- Improve stability of ``BulkImportWriter`` session ID. (`55 <https://github.com/treasure-data/pytd/pull/55>`__)
- Require td-client-python version 1.1.0 or later. (`56 <https://github.com/treasure-data/pytd/pull/56>`__)
- Add ``Clientexists(database, table)`` and ``Clientcreate_database_if_not_exists(database)`` method. (`58 <https://github.com/treasure-data/pytd/pull/58/>`__)

-------------------

- Clean up docstrings and launch documentation site.
(`43 <https://github.com/treasure-data/pytd/pull/43>`__, `#44 <https://github.com/treasure-data/pytd/pull/44>`__)
- Disable ``type``, one of the Treasure Data-specific query parameters, because it is conflicted with the ``engine`` option.
(`45 <https://github.com/treasure-data/pytd/pull/45>`__)
- Add `td-pyspark <https://pypi.org/project/td-pyspark/>`__ dependency for easily accessing to the `td-spark <https://treasure-data.github.io/td-spark/>`__ functionalities.
(`46 <https://github.com/treasure-data/pytd/pull/46>`__, `#47 <https://github.com/treasure-data/pytd/pull/47>`__)

-------------------

- Support ``if_exists="append"`` option in ``BulkImportWriter``.
(`38 <https://github.com/treasure-data/pytd/pull/38>`__)
- ``PrestoQueryEngine`` and ``HiveQueryEngine`` accept Treasure
Data-specific query parameters such as ``priority``.
(`41 <https://github.com/treasure-data/pytd/pull/41>`__)