[Proposal] Use Matlab's Python to check SPM Python.

It is possible to run Python code from Matlab. We have a lot of unit tests written in SPM. We could try to load spm-python as a Python module in Matlab, and then run the unittest on the wrapped functions
``` matlab
>> pyenv('Version', 'path/to/python')
>> py.importlib.import_module('spm')
% Run unit tests with `spm-python`
```
