title: How to byte reverse NSData output in Swift the littleEndian way?
body: <p>I have this output from NSData: &lt;00000100 84000c00 071490fe 4dfbd7e9&gt;</p>
  <p>So how could I byte reverse it in Swift and have this output: &lt;00000001 0084000c 1407fe90 fb4de9d7&gt;?</p>