Feature/enhanced skos support

[alexskr]

Manual upstream merge of ontoportal#15 into the NCBO fork
see:

• Feature: Add new skos endpoints for schemes, collections and SKOS labels ontoportal/ontologies_api#15

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.85965% with 71 lines in your changes missing coverage. Please review.

Project coverage is 73.69%. Comparing base (c2b3c41) to head (3341c66).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
helpers/request_params_helper.rb	21.05%	45 Missing ⚠️
controllers/classes_controller.rb	82.05%	7 Missing ⚠️
controllers/skos_xl_label_controller.rb	56.25%	7 Missing ⚠️
controllers/instances_controller.rb	75.00%	6 Missing ⚠️
controllers/collections_controller.rb	91.66%	2 Missing ⚠️
controllers/schemes_controller.rb	87.50%	2 Missing ⚠️
helpers/collections_helper.rb	92.85%	1 Missing ⚠️
helpers/schemes_helper.rb	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #192      +/-   ##
===========================================
- Coverage    74.31%   73.69%   -0.63%     
===========================================
  Files           57       63       +6     
  Lines         3095     3269     +174     
===========================================
+ Hits          2300     2409     +109     
- Misses         795      860      +65     

Flag	Coverage Δ
unittests	73.69% <68.85%> (-0.63%)	⬇️

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