Immobilus

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* Fix datetime.timestamp() behaviour on Py3
* Fix time.mktime() behaviour on Windows
* Add tests for windows

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* Expose direct start & stop functions (daybarr)
* bugfix: datetime.utcnow() and datetime.now() should return naive datetimes (daybarr)

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* bugfix: pass tz through to the original datetime.fromtimestamp when inactive. (daybarr)

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* bugfix: behaviour of isinstance() in Python3