Crate

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- bugfix: old versions of `six` caused import errors

- updated crate doc theme config

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- fixed python3.3 compatibility issue in sphinx script

- use new crate doc theme

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- replaced requests with urllib3 to improve performance

- add ``verify_ssl_cert`` and ``ca_cert`` as kwargs to ``Connection``,
``connect`` and as SQLAlchemy ``connect_args``

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- client: fix error handling in ``client.server_infos()``

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- updated crate to 0.32.3

- client: adding keyword arguments ``verify_ssl_cert`` and ``ca_cert``
to enable ssl server certificate validation

- client: disable ssl server certificate validation by default