Add Rhythmic Entrainment Source Separation (RESS)

[nbara]

Changes

• Add RESS code from https://www.sciencedirect.com/science/article/pii/S105381191630653X
• Update README
• Add example
• Update doc
• Fix mean_over_trials

[codecov]

Codecov Report

Merging #12 into master will increase coverage by 0.47%.
The diff coverage is 42.74%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   68.62%   69.09%   +0.47%     
==========================================
  Files          14       16       +2     
  Lines        1839     1867      +28     
==========================================
+ Hits         1262     1290      +28     
  Misses        577      577              

Impacted Files	Coverage Δ
meegkit/utils/base.py	85.71% <ø> (ø)
meegkit/utils/covariances.py	96.02% <ø> (ø)
meegkit/utils/sig.py	58.28% <ø> (+13.55%)	⬆️
meegkit/utils/auditory.py	14.81% <14.81%> (ø)
meegkit/dss.py	81.94% <87.50%> (ø)
meegkit/ress.py	100.00% <100.00%> (ø)
meegkit/utils/__init__.py	100.00% <100.00%> (ø)

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