Make it installable with pip

[whym]

See https://docs.python.org/3.1/distutils/packageindex.html and http://stackoverflow.com/questions/9411494/how-do-i-create-a-pip-installable-project for the procedure.

While we are at it, I also suggest changing the name (as in setup.py) to "pysais". pip install pysais is easier to type and remember than pip install Py-SAIS (capitalized + hyphen + allcaps).

[alpae]

I would also be very interested if the package is installable with pip.

[AlexeyG]

Ok. I will remove some functions from the module that are actually being used in a different project make it installable via pip.