Transform errors into plain objects since they don't stringify well

[Sebmaster]

I haven't found any output tests or I would've added one. Anyways - this restores proper error output behaviour.

log('msg', { error: err }) still doesn't work because of cycle.js, but log('msg', err) now returns

2015-12-21T20:23:43.904Z - error: [26934] msg Error: ha
    at null._onTimeout (/path/to/my.js:14:13)
    at Timer.listOnTimeout (timers.js:92:15)

In json mode:

{
  "message": "msg",
  "stack": "Error: ha\n    at null._onTimeout (/path/to/my/js:14:13)\n    at Timer.listOnTimeout (timers.js:92:15)",
  "level": "error",
  "label": "27635",
  "timestamp": "2015-12-21T20:29:15.983Z"
}

(There were no traces of either error.message, nor error.stack before.)

[alexandrubau]

Does it also work with other objects? Not just Errors.

[indexzero]

I see where you are going with this fix, but there is no need for a new function. Just add this logic into exports.clone.

[Sebmaster]

Fixed, I'd like to get nested error objects working too, but that'll probably have to wait a bit.

[indexzero]

This makes a lot more sense to me.