Add sanakoyeu_et_al_2018 data

[codecov[bot]]

Codecov Report

Merging #162 into sanakoyeu-2018 will decrease coverage by 0.0%. The diff coverage is n/a.

@@               Coverage Diff                @@
##           sanakoyeu-2018    #162     +/-   ##
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- Coverage            98.5%   98.5%   -0.1%     
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  Files                  41      40      -1     
  Lines                1455    1412     -43     
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- Hits                 1434    1391     -43     
  Misses                 21      21             

Impacted Files	Coverage Δ
pystiche_papers/sanakoyeu_et_al_2018/__init__.py	100.0% <0.0%> (ø)
pystiche_papers/sanakoyeu_et_al_2018/_modules.py

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[jbueltemeier]

There is still an image augmentor missing which modifies the randomly selected image from the dataset by some transformations like scaling or rotation. See here. I don't think that this is a part of the image_transform, but one that belongs to the batch_sampler. Or what do you think?

[pmeier]

@jbueltemeier During rebase, I accidentally removed the commits you made to this branch today. Could you re-add them?

[pmeier]

@jbueltemeier The augmentation proved to be a lot of more work than I expected. I'll merge this now and add them in a follow-up PR.

[pmeier]

Superseded by #177.