Added newline characters before prefixes and at end 

When using this extension in Brackets on my mac, I was getting one line output like this:

    /** * Description * @param {type} url, Description * @param {type} callback Description */

I modified it to put newlines between each line, resulting in output like this:
````
/**
 * Description
 * @param {type} url Description
 * @param {type} callback Description
 */
````

I hope you find this code tweak helpful... and thanks for creating this extension!