Segment

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* fixing requirements.txt

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* adding versioned requirements.txt file

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* Adding fixes for handling invalid json types
* Fixing byte/bytearray handling
* Adding `logging.DEBUG` fix for `setLevel`
* Support HTTP keep-alive using a Session connection pool
* Suppport universal wheels
* adding .sentAt
* make it really testable
* fixing overflow test
* removing .io's
* Update README.md
* spacing

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* adding top level send option

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* fixing debug logging levels

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* fixing unicode handling, for write_key and events
* adding six to requirements.txt and install scripts