Remove lineComment from JSON

According to multiple sources (https://plus.google.com/+DouglasCrockfordEsq/posts/RK8qyGVaGSr, http://stackoverflow.com/questions/244777/can-i-comment-a-json-file, http://fadefade.com/json-comments.html and http://zehfernando.com/2013/commenting-json-files/), there is no possibility to add (line) comments to a json file.
So we should consider removing the lineComment `//` from JSON.