Pureport-client

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* Don't call .json for delete calls

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* Add ConnectionState enum and address code review feedback
* Updating connection create/update/delete to throw errors on bad states
* Add retry handling to update/delete
* Use exponential backoff to wait until connection is active
* Update documentation on how to interact with API client

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* Add the MIT license
* Throw a subclasses of HttpClientException for easier error handling
* Initial commit of the Pureport Python Client