Refactor: Migrate to Minitest 5 and ActiveSupport 5

[alexskr]

Minitest 5 update, supersedes #143

• update minitest to v5
• fix for invalid unit tests that didn't manifest unitl this update TestNotesController#test_proposal_lifecycle = DEPRECATED: Use assert_nil if expecting nil from /srv/ontoportal/ontologies_api/test/controllers/test_notes_controller.rb:111. This will fail in Minitest 6.
• minor minitest style updates

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.39%. Comparing base (15a5d03) to head (e8301e6).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #165   +/-   ##
========================================
  Coverage    73.39%   73.39%           
========================================
  Files           53       53           
  Lines         2954     2954           
========================================
  Hits          2168     2168           
  Misses         786      786           

Flag	Coverage Δ
unittests	73.39% <ø> (ø)

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[alexskr]

TestRecommenderV1Controller unit test has intermittent failures under AllegroGraph

1) Failure:
TestRecommenderV1Controller#test_recommend_query [test/controllers/test_recommender_v1_controller.rb:27]:
Failed to return 3 recommendations.
Expected: 3
  Actual: 0

recommender_v1 is not used and should be deprecated. I don't think its worth troubleshooting this failing test