Included python_support

Solves: https://github.com/numenta/nupic.core/issues/256

To be sincere, I didn't like the changes brought by this PR. I had to bring the python scripts (to get prefix and version of python) into CMake file and still we will have to use a flag to say if CMake should build python stuff or not (in order to users specify when want a stand-alone c++ library). These changes gave me a feeling that we are going backwards. Maybe this is only an impression of mine. By the way I would like some feedback. If you think it is fine, then I'll keep working on this...  if not, we will have to change the strategy..