fix definition of CWL schema fields causing validation error when parsing body

[fmigneault]

• Fix definition of CWL schema.org namespaced fields (i.e.: s:author and s:dateCreated) causing
  schema deserialization error when validation the submitted request body against typical examples provided in
  CWL Metadata and Authorship.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.35%. Comparing base (7847dce) to head (07f5dc5).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
+ Coverage   87.28%   87.35%   +0.06%     
==========================================
  Files          80       80              
  Lines       20625    20663      +38     
  Branches     2809     2811       +2     
==========================================
+ Hits        18003    18050      +47     
+ Misses       1876     1868       -8     
+ Partials      746      745       -1     

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