Developers can view full REST calls and responses

Currently, if a REST call fails a developer has no information about the REST call, and does not even necessarily know if it failed.

It's tricky for a developer because the problem could be in many places:  in the restclient definition, or it could be with the external service itself, or it could be in the FTL or in the App configuration. Its easy to introduce a problem in the call since the calls themselves are often dynamically constructed.

Acceptance Criteria:

• An error while making a REST call should be written to the log.
  • Dedicated log file?
• All details about the request and response should be included - body, cookies, headers, parameters. 
• Secure information should not be written to the log.

Additional ideas for later:

• Secure info is only written when the server is in developer mode.
• If call can be written in a format compatible with 'curl' that is a bonus, because then developers could try it.