[ENH] Outputs maps in RESS

[nbara]

Fixes #19

[codecov]

Codecov Report

Merging #20 (b452968) into master (3d70356) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   71.96%   72.03%   +0.07%     
==========================================
  Files          16       16              
  Lines        1869     1874       +5     
==========================================
+ Hits         1345     1350       +5     
  Misses        524      524              

Impacted Files	Coverage Δ
meegkit/ress.py	100.00% <100.00%> (ø)
meegkit/utils/__init__.py	100.00% <100.00%> (ø)
meegkit/utils/matrix.py	83.15% <100.00%> (+0.23%)	⬆️

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