FIX: Normalize extensions for leading dot & update doctests to new resources

[oesteban]

Resolves: #86.

[codecov]

Codecov Report

Merging #92 (c33b9f7) into master (af8c013) will decrease coverage by 0.07%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
- Coverage   89.77%   89.69%   -0.08%     
==========================================
  Files           5        5              
  Lines         225      233       +8     
==========================================
+ Hits          202      209       +7     
- Misses         23       24       +1     

Flag	Coverage Δ
api	89.69% <87.50%> (-0.08%)	⬇️
config	55.79% <12.50%> (-1.54%)	⬇️
datalad	80.68% <87.50%> (+0.24%)	⬆️
dls3	59.65% <87.50%> (+0.98%)	⬆️
s3	62.66% <87.50%> (+0.88%)	⬆️

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Impacted Files	Coverage Δ
templateflow/api.py	80.20% <87.50%> (+0.66%)	⬆️

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