title: boundingRectWithSize for NSAttributedString returning wrong size
body: <p>I am trying to get the rect for an attributed string, but the boundingRectWithSize call is not respecting the size I pass in and is returning a rect with a single line height as opposed to a large height (it is a long string). I have experimented by passing in a very large value for the height and also 0 as in the code below, but the rect returned is always the same.</p>
  
  <pre><code>CGRect paragraphRect = [attributedText boundingRectWithSize:CGSizeMake(300,0.0)
    options:NSStringDrawingUsesDeviceMetrics
    context:nil];
  </code></pre>
  
  <p>Is this broken, or do I need to do something else to have it returned a rect for wrapped text?</p>