Merge pull request #110 from LorenzE/TMSI_EEG

TMSI EEG
averaging + covariance toolbox
removed thresholding
Cleanup
- implemented get data function in EEGoSportsDriver
- continued to work on getSampleMatrixValue function for eegosports plugin
- added warning when nasion RAP and LAP could not be created
Merge branch 'master' of https://github.com/mne-tools/mne-cpp into TMSI_EEG
- minor changes in test signal generation