Enh: cli versioning

[mgxd]

Fixes #2046 .

Changes proposed in this pull request

$> nipypecli version
1.0.0-dev+gf856746

[codecov-io]

Codecov Report

Merging #2054 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #2054      +/-   ##
==========================================
- Coverage   72.17%   72.17%   -0.01%     
==========================================
  Files        1134     1134              
  Lines       57098    57101       +3     
  Branches     8179     8179              
==========================================
+ Hits        41210    41212       +2     
- Misses      14602    14603       +1     
  Partials     1286     1286

Flag	Coverage Δ
#smoketests	72.17% <66.66%> (-0.01%)	⬇️
#unittests	69.78% <66.66%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/scripts/cli.py	40.47% <66.66%> (+0.97%)	⬆️

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