MOABB release version 0.2.0 (NeuroTechX#51)

Compatible with mne 0.16, seaborn 0.9

Schirrmeister2017 high gamma dataset added to motor imagery

Basic P300 paradigm and datasets (EPFL, Brain Invaders) added

Basic SSVEP paradigm, datasets, and pipelines added

Doc fixes

Added context used in publication