title: Filter by date range
body: <p>In Ember it is easy to filter an array where you are looking for matching values ( Only return name == "John) What I can't figure out is how to filter with a greater than or less than ( Return all objects whose startDate is before today</p>
  
  <p>In my app I have a collection of deliverables. I want to divide these deliverables into three categories: Due within ten days, Past due, and then the rest. </p>
  
  <p>I found the following example in another SO post, but can't figure out how to use it to accomplish my goal</p>
  
  <pre><code>filterComputed: function() {
    return this.get('content').filter(function(item, index, enumerable){
      return item.firstName == 'Luke';
    });
  }.property('content.@each')
  </code></pre>