title: Human friendly date descriptions with NSDate on iOS
body: <p>I want to display NSDates in a "human-friendly way", such as "last week", or "a few days ago". Something similar to <a href="http://ocpsoft.com/prettytime/">Pretty Time for Java</a>.</p>
  
  <p>What's the best way to do this, subclassing NSDateFormatter?  Before I go and reinvent the wheel, is there already some library for this?</p>