Fixed license in setup.py
Enhanced calculate_csp to take epo and classindices:

* added unit tests
* updated docstrings
* Updated MI example notebook
Fixed some typos in the docstrings.
Fixed typo in docstring
First implementation with tests

* No docsstrings yet
Re-added subsampling down to 50Hz.

It somehow got removed during one of the previous commits.
Enhanced spoc docstring.
Finalized spoc. Thank you very much Sven!
Merge branch 'spoc'