ENH: Use obliquity directly from nibabel

[oesteban]

No description provided.

[codecov-io]

Codecov Report

Merging #18 into master will decrease coverage by 1.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   65.61%   64.49%   -1.13%     
==========================================
  Files           9        8       -1     
  Lines         538      521      -17     
  Branches       68       68              
==========================================
- Hits          353      336      -17     
  Misses        152      152              
  Partials       33       33

Flag	Coverage Δ
#unittests	64.49% <100%> (-1.13%)	⬇️

Impacted Files	Coverage Δ
nitransforms/patched.py	56% <ø> (-7.34%)	⬇️
nitransforms/linear.py	56.96% <100%> (ø)	⬆️

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