Output response.error after receiving invalid responses

[rhoggSugarcrm]

In addition to #139, we also need to output the value of response.error when we receive an invalid response.

response.error.code is particularly interesting, as it sometimes shows up in cases like this.

See https://dareid.github.io/chakram/jsdoc/global.html#ChakramResponse so the API I'm talking about is clear.

[rhoggSugarcrm]

Also probably useful: including the debugId of the request that failed, so it's easier to match up with the THORN_VERBOSE output.

Not sure if it will work, but it might.

[rhoggSugarcrm]

Also keep request/request#2395 in mind. Might even want to submit a PR or issue to Chakram if I can think of one.