Td-client

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* Fix API client to retry POST requests properly if ``retry_post_requests`` is set to ``True`` (5)
* Show warnings if imported data don't have ``time`` column

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* Fixed a JSON parse error in ``job.result_format("json")`` with multipe result rows (4)
* Refactored model classes and tests

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* Stopped using syntax added in recent Python releases

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* Fix SSL verification errors on Python 2.7 on Windows environment.
Now it uses ``certifi`` to verify SSL certificates if it is available.

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* Fix support for Windows environments
* Fix byte encoding problem in ``tdclient.api.APIimport_file`` on Python 3.x

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* Support specifying job priority in its name (e.g. "NORMAL", "HIGH", etc.)
* Convert job priority number to its name (e.g. 0 => "NORMAL", 1 => "HIGH", etc.)
* Fix a broken behavior in ``tdclient.model.Jobwait`` when specifying timeout
* Fix broken ``tdclient.client.Clientdatabase()`` which is used from ``tdclient.model.Tablepermission()``
* Fix broken ``tdclient.Client.Clientresults()``