code: function readFile(fileName) {
  	if (/^https?:/.test(fileName)) {
  		return readFileFromURL(fileName);
  	}
  
  	return new Promise((resolve, reject) => {
  		fs.readFile(fileName, (err, content) => err ? reject(err) : resolve(content));
  	});
  }
docs: Reads contents of given file path or URL as buffer
  @param  {String} fileName File path or URL
  @return {Promise}