Adding prototype notebook

I added a prototype notebook, which I tried to get to work with nbviewer, but I get an import error on geostatsmodels.  This will require more research.

I also added a .gitignore file to hide .pyc files, etc.

Minor edits to readme.

Appended semicolons to matplotlib function calls in scattergram to prevent weird little messages appearing when that function is used in IPython notebooks.