title: sort JSON by date
body: <p>I know this must be relatively simple, but I have a dataset of JSON that I would like to sort by date.  So far, I've run into problems at every turn.
  Right now I have the date stored as <code>this.lastUpdated</code>.
  I have access to jquery if that helps, but I realize the .sort() is native JS.
  Thanks in advance.</p>