Specify axes with anatomical labels

[fepegar]

Resolves #185.

[codecov]

Codecov Report

Merging #257 into master will decrease coverage by 0.71%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master     #257      +/-   ##
==========================================
- Coverage   93.23%   92.52%   -0.72%     
==========================================
  Files         105      105              
  Lines        4717     4749      +32     
==========================================
- Hits         4398     4394       -4     
- Misses        319      355      +36     

Impacted Files	Coverage Δ
torchio/transforms/transform.py	78.48% <ø> (-0.14%)	⬇️
torchio/data/image.py	89.55% <12.50%> (-10.45%)	⬇️
torchio/data/subject.py	85.85% <18.18%> (-8.46%)	⬇️
...ansforms/augmentation/intensity/random_ghosting.py	97.61% <60.00%> (-2.39%)	⬇️
...hio/transforms/augmentation/spatial/random_flip.py	94.23% <86.36%> (-5.77%)	⬇️
tests/transforms/augmentation/test_random_flip.py	100.00% <100.00%> (ø)
...ts/transforms/augmentation/test_random_ghosting.py	100.00% <100.00%> (ø)
...o/transforms/augmentation/intensity/random_swap.py	94.52% <0.00%> (-1.37%)	⬇️

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