#6 Trace string parse method changed.
Now, we generate JSON like this:
```json
{
  "version": "0.1.0",
  "timestamp": "2014-06-04T10:19:36-0200",
  "message": "Uncaught ReferenceError: retren is not defined",
  "exception": {
    "message": "Uncaught ReferenceError: retren is not defined",
    "trace": "?@http://localhost/samebug_client/:22"
  }
}