ENH : Allow regularized covariance in CSP
interfaced with sklearn covariance estimators
interfaced with mne.covariance.regularize
add tests for regularized csp
CSP fit with mne.covariance removed
regularized CSP example added
regularized CSP example modified
comment modification
Merge pull request #691 from trachelr/csp-cov-reg

ENH : Allow regularized covariance in CSP