title: Convert long month name to int
body: <p>I understand how to use an <code>NSDateFormatter</code> to convert a month component into a long name string, but how does one convert a month name to an <code>int</code>?</p>
  
  <p>I've been using a switch statement to convert, but I'm thinking there must be a simpler way.</p>
  
  <p>For example, I'd like to convert "May" to 5.</p>