Features
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* Automatic Protocol Version Downgrade (PYTHON-240)
* cqlengine Python 2.6 compatibility (PYTHON-288)
* Double-dollar string quote UDF body (PYTHON-345)
* Set models.DEFAULT_KEYSPACE when calling set_session (github #352)
Bug Fixes
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* Avoid stall while connecting to mixed version cluster (PYTHON-303)
* Make SSL work with AsyncoreConnection in python 2.6.9 (PYTHON-322)
* Fix Murmur3Token.from_key() on Windows (PYTHON-331)
* Fix cqlengine TimeUUID rounding error for Windows (PYTHON-341)
* Avoid invalid compaction options in CQL export for non-SizeTiered (PYTHON-352)