FIX: Improvements to the CircleCI workflow

[oesteban]

• Don't deploy to Pypi if build_docs fails (close CircleCI: Do not deploy to pypi if build_docs fails #150)
• Do not cache reportlets folder (see ENH: Integrate new infrastructure in NiWorkflows to handle spatial references #159 (comment))

[codecov-io]

Codecov Report

Merging #162 into master will decrease coverage by 50.53%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #162       +/-   ##
===========================================
- Coverage   77.64%   27.11%   -50.54%     
===========================================
  Files          15       15               
  Lines         841      841               
  Branches      104      104               
===========================================
- Hits          653      228      -425     
- Misses        145      603      +458     
+ Partials       43       10       -33

Flag	Coverage Δ
#ds005	?
#ds054	?

Impacted Files	Coverage Δ
smriprep/cli/run.py	2.65% <0%> (-71.69%)	⬇️
smriprep/workflows/norm.py	31.57% <0%> (-68.43%)	⬇️
smriprep/__main__.py	16.66% <0%> (-66.67%)	⬇️
smriprep/workflows/surfaces.py	14.44% <0%> (-64.45%)	⬇️
smriprep/workflows/outputs.py	13.59% <0%> (-57.29%)	⬇️
smriprep/workflows/base.py	30.9% <0%> (-54.55%)	⬇️
smriprep/workflows/anatomical.py	23.94% <0%> (-53.53%)	⬇️
smriprep/interfaces/freesurfer.py	19.69% <0%> (-40.91%)	⬇️
smriprep/interfaces/reports.py	57.33% <0%> (-24.01%)	⬇️
smriprep/utils/bids.py	56.66% <0%> (-6.67%)	⬇️
... and 1 more

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[effigies]

Looks sensible