Qosic-sdk

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* Change MtnConfig step default and minimal value.
* Add exception list to the docs.
* Remove PollRuntimeError, now the poll function fails while raising the right exception.
* When active_logging is set to True, the client now collect responses in the client property *collected_responses*.

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* Change timeout defaults.
* Update docs.

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* Write some tests.
* The internal http client handles non-json responses better.

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* First release on PyPI.