title: What is a method that can be used to increment letters?
body: <p>Does anyone know of a Javascript library (e.g. underscore, jQuery, MooTools, etc.) that offers a method of incrementing a letter?</p>
  
  <p>I would like to be able to do something like:</p>
  
  <pre><code>"a"++; // would return "b"
  </code></pre>