HttpStatusException should include body in the Exception

[touchdown]

can we have something like

case class HttpStatusException(
  code: Int,
  statusLine: String,
  body: String
) extends RuntimeException(code + " Error: " + statusLine +  "Body: " + body)

So we can forward the body of the exception to users from responses? I can take that on if that makes sense

[gerashegalov]

we would like this addressed as well.