Settled for MIT license:

- Added LICENSE
- Updated setup.py
- Bumped version
Removed COPYING file with old GPL license.
Added method to plot csp patterns.
Cleanup
Polish.
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'
Automatically detect presence of coverage or python-coverage.
Fix for Numpy1.8
Added security checks, protecting against marker loss.
Fixed typo
Cleanup blockbuffer test.
Cleanup tests.