Add response pipe option for extra sanity checks

[sebasslash]

There are instances I'd like to inspect the response body. Moreover, I would like to be able to specify the destination this response body will be piped to, albeit stdout or some file inspect.txt.

exampleTest:
  request: 
    path: /example/resource,
    method: GET
  validation:
    statuscode: 200
    pipeResponse: stdout
    body:
    - body[0].id == "foo"
    - something else here

Thanks.