Add sanakoyeu_et_al_2018 main

[jbueltemeier]

This script basically works, but it hasn't even been run through completely yet. This will happen in the next few days.

[codecov]

Codecov Report

Merging #213 (33d64f3) into sanakoyeu-2018 (7add7f8) will decrease coverage by 0.0%.
The diff coverage is 40.6%.

@@               Coverage Diff                @@
##           sanakoyeu-2018    #213     +/-   ##
================================================
- Coverage            94.8%   94.8%   -0.1%     
================================================
  Files                  47      47             
  Lines                2352    2251    -101     
================================================
- Hits                 2232    2136     -96     
+ Misses                120     115      -5     

Impacted Files	Coverage Δ
pystiche_papers/sanakoyeu_et_al_2018/_nst.py	48.5% <20.8%> (+0.7%)	⬆️
pystiche_papers/sanakoyeu_et_al_2018/_data.py	98.8% <100.0%> (+<0.1%)	⬆️
pystiche_papers/sanakoyeu_et_al_2018/_loss.py	100.0% <100.0%> (ø)
...tiche_papers/sanakoyeu_et_al_2018/_augmentation.py	86.9% <0.0%> (-0.1%)	⬇️
pystiche_papers/li_wand_2016/_loss.py	98.7% <0.0%> (-0.1%)	⬇️
pystiche_papers/data/utils.py	100.0% <0.0%> (ø)
pystiche_papers/li_wand_2016/_nst.py	100.0% <0.0%> (ø)
pystiche_papers/ulyanov_et_al_2016/_loss.py	100.0% <0.0%> (ø)
pystiche_papers/li_wand_2016/_utils.py	100.0% <0.0%> (+3.9%)	⬆️
... and 1 more

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