FIX: Ensure templateflow Layout is re-indexed when updating

[mgxd]

Closes #58

Needs a unittest.

Also fixes the failing unittest, and catches a bug where allow_redirect was not being passed onto certain requests.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1c473df). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #59   +/-   ##
=========================================
  Coverage          ?   87.85%           
=========================================
  Files             ?        5           
  Lines             ?      214           
  Branches          ?        0           
=========================================
  Hits              ?      188           
  Misses            ?       26           
  Partials          ?        0           

Flag	Coverage Δ
#api	87.85% <100.00%> (?)
#config	55.14% <85.71%> (?)
#datalad	78.50% <100.00%> (?)
#dls3	55.60% <50.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
templateflow/conf/__init__.py	88.88% <100.00%> (ø)
templateflow/conf/_s3.py	97.91% <100.00%> (ø)
templateflow/api.py	77.90% <0.00%> (ø)
templateflow/conf/bids.py	100.00% <0.00%> (ø)
templateflow/__init__.py	100.00% <0.00%> (ø)

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[mgxd]

@oesteban pinging here