Added __version__ string
Use version string in docs and setup.py
Added GPL2 license text
Updated setup.py
Fixed typo
Added more trove classifiers.
Bump version for pypi
Fixed typo in long description
Added hint how to install via pip.
Updated url to point to the online docs.
Fixed typo
Updated README
Added test for equivalent axis indices
Made segment_dat much much faster.
Fixed typo.
Added ERP classification from bci competition 3, ds 2
Updated README and mention the BCI Competition 3, data set 2 experiment.
Fixed spectrum in many ways:

* return proper Data object
* return the correct frequencies and amplitudes
* added doctest
* updated docstrings
Fixed variance to remove axes, names and unit correctly.

* Added unittests for that
Added BCI Competition 3, Data Set 1 example.