Add support for multiline results #35

[Eoksni]

Closes #35.

Example usage:

/**
 * @example
 *   subtract(1, 2)
 *   // => {
 *   // =>   normal: -1,
 *   // =>   reverse: 1
 *   // => }
 */

 function subtract(x, y) {
  return {
    normal: x - y,
    reverse: y - x
  };
}

[coveralls]

Coverage remained the same at 76.963% when pulling 2b57ab9 on Eoksni:develop into ccd6cdb on yamadapc:master.

[yamadapc]

I don't really understand. It was already supported then, but missing some error handling?