Feature: add the attributes dcterms:created and dcterms:modified to classes model

[syphax-bouazzouni]

No description provided.

[codecov]

Codecov Report

Merging #161 (1e318a0) into master (b5057b4) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   80.75%   80.73%   -0.03%     
==========================================
  Files          63       63              
  Lines        4848     4853       +5     
==========================================
+ Hits         3915     3918       +3     
- Misses        933      935       +2     

Flag	Coverage Δ
unittests	80.73% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
lib/ontologies_linked_data/models/class.rb	82.98% <100.00%> (+0.08%)	⬆️
...tologies_linked_data/models/ontology_submission.rb	78.57% <0.00%> (-0.17%)	⬇️
...linked_data/models/properties/ontology_property.rb	84.78% <0.00%> (+0.06%)	⬆️

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