added the python script

@karlnapf 
take a look at this.
have a look at the other python examples, try to copy their style.

 * bsd license on top
 * no docstrings (we do this via the descriptions)
 * a function that does the method, returns the predictions and possibly inference objects
 * the function takes some parameters, different combinations of those parameters are provided in a list
 * results of function are used for integration testing, you can put all possible inference methods in there
 * maybe a rename to variational_classifier would be useful?
 * see for example the libsvm classifier example