support remote ref on parameters, requestBodies and responses

[koxudaxi]

Related issues

#51

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@a049a01). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #57   +/-   ##
=========================================
  Coverage          ?   94.55%           
=========================================
  Files             ?        2           
  Lines             ?      312           
  Branches          ?        0           
=========================================
  Hits              ?      295           
  Misses            ?       17           
  Partials          ?        0           

Flag	Coverage Δ
unittests	94.55% <0.00%> (?)

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