Impyla

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* **Improvements**
- Implement simple retry which throws the underlying HttpError if retrying fails
- Ugprade Thift to 0.11.0 for Python 2
- Add build script

* **Bug Fixes**
- Server certs should not be verified if SSL is enabled and ca_cert is not specified
- Added "fetchType" to TFetchResultsReq.
- Fix Thrift compilation with current Impala

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* **Improvements**
- Implement GSSAPI authentication over http transport. (415)
- Vendor thrift classes with Python 3 277 (404)
- Add HTTP code handling to THttpClient (380)
- Disable failing tests - 401 (402)

* **Bug Fixes**
- Fix 418, no 'message', just cast to string (419)
- Fix DATE, VARCHAR handling: 410 (411)

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* **Bug Fixes**
- Fix specifying dependency on thrift package

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* **Bug Fixes**
- Fix an issue that prevented use of Impyla with Python 2.6 (375)

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* **Bug Fixes**
- Fix an issue whereby impyla incorrectly assumes there's no more data to fetch (369)

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* **Improvements**
- Add HTTP endpoint support (359)
- Add rowcounts property to cursor object to return the number of rows affected (346)

* **Bug Fixes**
- Set long_description_content_type to markdown in setup.py (364)
- Fix ImportError 'THttpClient' in python3+ (363)
- Enable executemany() to pass parameter configuration to inner execute() (361)
- Minor docstring corrections (355)
- Make thriftpy2 range locked, not specific-version locked (353)
- Fixed numeric parameter substitution bug (348)
- Add thrift_sasl as an official dependency (273)