Organized code so that we have a geostatsmodels namespace for imports, a...

...dded setup script, and explicit MIT license file.

Changes:
 - I added a geostatsmodels namespace so that users will import the code thusly: from geostatsmodels import kriging as k
 - I wrote a simple setup.py script which puts the geostatsmodels package in site-packages, and your *_example scripts somewhere in your path.  It also includes metadata about authors, contact info, etc.
 - I added install/uninstall instructions to the README.
 - I added the MIT license file to the repository, since this seems to be the Thing To Do.

TODO:
 - Your example scripts ought to be re-written as automated tests, a la unittest, nose, etc.  I need to do some research on how to do this, and how/where to include test input data in the package.
 - Determine whether we want the geostatsmodels.kriging file to have the implementations of _all_ of the kriging variants, and semivariogram models, etc. or whether kriging should be split out into it's own package.