Td-client

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* Avoid an exception raised when a ``start`` is not set for a schedule (12)
* Fix getting database names of job objects (13)
* Add Data Connector APIs
* Add deprecation warnings on the usage of "item tables"
* Show ``cumul_retry_delay`` in retry messages

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* Fix bugs in ``ScheduledJob`` and ``Schedule`` models

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* Fix ``OverflowError`` on importing integer value longer than 64 bit length which is not supported by msgpack specification. Those values will be converted into string.

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* Add Python Database API (PEP 0249) compatible connection and cursor.
* Add varidation to the part name of a bulk import. It should not contain '/'.
* Changed default wait interval of job models from 1 second to 5 seconds.
* Fix many potential problems/warnings found by landscape.io.

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* Set default timeout of API client as 60 seconds.
* Change the timeout of API client from ``sum(connect_timeout, read_timeout, send_timeout)`` to ``max(connect_timeout, read_timeout, send_timeout)``
* Change default user-agent of client from ``TD-Client-Python:{version}`` to ``TD-Client-Python/{version}`` to comply RFC2616

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* Improve the job model. Now it retrieves the job values automatically after the invocation of ``wait``\ , ``result`` and ``kill``.
* Add a property ``result_schema`` to ``Job`` model to provide the schema of job result
* Improve the bulk import model. Add a convenient method named ``upload_file`` to upload a part from file-like object.
* Support CSV/TSV format on both streaming import and bulk import
* Change module name; ``tdclient.model`` -> ``tdclient.models``