Remove BOM characters from JSON file before parsing

[mmukarram]

With the most recent version bump from 0.3.1 to 0.3.2, the dependency migration for the parser from jsonlint to json-parse-helpfulerror breaks when processing JSON files that have Byte-order Mark characters. Since the JSON files are already being loaded with UTF-8 encoding, it would make sense to remove these characters.

Planning on modifying the following lines (and tests) and sending a pull request :

    data = fs.readFileSync(path, 'utf-8');

   // data = data.replace(/\UFEFF/g, '');

    if (options.replace) {
        data = exports.replace(data, options.replace);
    }

[kof]

thanks, will accept a PR