JSCS: Updated with latest changes

JSCS v1.3 is recently released. See their [changelog.md](https://github.com/mdevils/node-jscs/blob/86b3a9bd9030a0cc0947e564221a4aa948fc7581/CHANGELOG.md).

This PR brings:
* Using JSON based Custom reporter.
* Renamed .jscs.json to .jscsrc  (JSON-file with comments).