added commonly expected meta-data

Hi Louis,

I've made some minor changes in setup.py in order to replace default values by more meaningful ones. This fixes for instance the creation of the file PackageName-1.0-py2.7.egg-info when running "setup.py install" instead of something more appropriate such as "SPI_Py-1.0-py2.7.egg-info".

I've also added a couple of meta-data in setup.py to conform a bit more to expected content.

Best regards.

Eric