Fix the OBO Foundry synchronization script

[jvendetti]

Our OBO Foundry synchronization script has been erring out with a JSON::ParserError. This pull request eliminates the use of GitHub GraphQL queries to fetch files form GitHub in favor of using simple HTTP requests. It also adds the faraday and faraday-follow_redirects gems to the gemspec file.

Resolves #78

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 17.64706% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 54.92%. Comparing base (252edb2) to head (290c86d).

Files	Patch %	Lines
lib/ncbo_cron/obofoundry_sync.rb	17.64%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #79      +/-   ##
===========================================
+ Coverage    54.51%   54.92%   +0.40%     
===========================================
  Files           16       16              
  Lines         1240     1229      -11     
===========================================
- Hits           676      675       -1     
+ Misses         564      554      -10     

Flag	Coverage Δ
unittests	54.92% <17.64%> (+0.40%)	⬆️

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