Hyper-parameters: proof of concept

[pmeier]

Addresses #167

This adds the HyperParameters class that should be used to hold all hyper parameters of a paper. For the proof of concept I'm applying this only to gatys_ecker_bethge_2016 for now.

ToDo:

• [x] add tests for HyperParameters

[codecov[bot]]

Codecov Report

Merging #181 into hyperparameters will increase coverage by 0.0%. The diff coverage is 100.0%.

@@               Coverage Diff               @@
##           hyperparameters    #181   +/-   ##
===============================================
  Coverage             98.7%   98.8%           
===============================================
  Files                   38      39    +1     
  Lines                 1406    1450   +44     
===============================================
+ Hits                  1389    1433   +44     
  Misses                  17      17           

Impacted Files	Coverage Δ
pystiche_papers/gatys_ecker_bethge_2016/_loss.py	100.0% <100.0%> (ø)
pystiche_papers/gatys_ecker_bethge_2016/_nst.py	100.0% <100.0%> (ø)
pystiche_papers/gatys_ecker_bethge_2016/_utils.py	100.0% <100.0%> (ø)
pystiche_papers/utils/__init__.py	100.0% <100.0%> (ø)
pystiche_papers/utils/hyper_params.py	100.0% <100.0%> (ø)

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[pmeier]

@jbueltemeier you can ignore the small compatibility changes to the conftest.py files for your review.