RF: Use looseversion package instead of vendoring

[effigies]

Closes #3468.

[codecov]

Codecov Report

Merging #3477 (8557831) into master (b410d08) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3477   +/-   ##
=======================================
  Coverage   65.25%   65.25%           
=======================================
  Files         309      309           
  Lines       40838    40838           
  Branches     5376     5376           
=======================================
  Hits        26647    26647           
  Misses      13117    13117           
  Partials     1074     1074           

Flag	Coverage Δ
unittests	65.02% <100.00%> (ø)

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Impacted Files	Coverage Δ
nipype/info.py	87.30% <ø> (ø)
nipype/__init__.py	53.19% <100.00%> (ø)
nipype/interfaces/dipy/preprocess.py	25.42% <100.00%> (ø)
nipype/interfaces/dipy/reconstruction.py	30.69% <100.00%> (ø)
nipype/interfaces/dipy/registration.py	83.33% <100.00%> (ø)
nipype/interfaces/dipy/stats.py	83.33% <100.00%> (ø)
nipype/interfaces/dipy/tracks.py	29.60% <100.00%> (ø)
nipype/utils/config.py	63.24% <100.00%> (ø)
nipype/utils/misc.py	78.98% <100.00%> (ø)

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