Implement HTTP Return implicit status codes and content types

[Thevakumar-Luheerathan]

Purpose

Resolves #491

Goals

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
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[codecov]

Codecov Report

Merging #493 (5be607f) into svc-impl (dbdc250) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             svc-impl     #493   +/-   ##
===========================================
  Coverage       52.84%   52.84%           
  Complexity        139      139           
===========================================
  Files              35       35           
  Lines            1001     1001           
  Branches          116      116           
===========================================
  Hits              529      529           
  Misses            411      411           
  Partials           61       61           

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