adding testing_pytest that removed nose (it will be used temp. for te…

[djarecka]

…sts converted to pytest)

[codecov]

Codecov Report

Merging #838 into master will decrease coverage by 3.76%.
The diff coverage is 39.44%.

@@            Coverage Diff             @@
##           master     #838      +/-   ##
==========================================
- Coverage   90.36%   86.59%   -3.77%     
==========================================
  Files          96       98       +2     
  Lines       12196    12305     +109     
  Branches     2136     2154      +18     
==========================================
- Hits        11021    10656     -365     
- Misses        832     1307     +475     
+ Partials      343      342       -1

Impacted Files	Coverage Δ
nibabel/testing_pytest/np_features.py	33.33% <33.33%> (ø)
nibabel/testing_pytest/__init__.py	40% <40%> (ø)
nibabel/dft.py	15.64% <0%> (-65.34%)	⬇️
nibabel/freesurfer/io.py	51.11% <0%> (-43.12%)	⬇️
nibabel/pydicom_compat.py	77.27% <0%> (-22.73%)	⬇️
nibabel/environment.py	75% <0%> (-20%)	⬇️
nibabel/nicom/dicomwrappers.py	82.05% <0%> (-8.86%)	⬇️
nibabel/casting.py	80.42% <0%> (-5.11%)	⬇️
nibabel/openers.py	91.08% <0%> (-3.97%)	⬇️
nibabel/__init__.py	89.28% <0%> (-3.58%)	⬇️
... and 10 more

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