Tsip

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* Added Report Packet 0x58: GPS System Data from the Receiver.
* Fixed Report Packet 0x47: Signals Levels for Tracked Satellites.
* Fixed Report Packet 0x6D: Satellite Selection List.x
* Added `docs/examples/example2.py` wich provides a more comprehensive
template program than the example in the README.

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* Fixed README.rst so it renders properly on PyPi.

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* Argument to ``tsip.Packet()`` can now also be a tuple or list
(inspired by Criss Swaim).
* Changed development status from alpha to beta.
* Cleaned up lots of code to satisfy flake8.

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* Rewritten from scratch.
* Implements almost complete set of TSIP commands supported by
Trimble Copernicus II and Thunderbolt/Thunderbolt-E GPS
receivers.

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* First release on PyPI.