title: lodash orderBy on nested property
body: <p>I'm using <code>v4.11.0</code>.
  I would like sort objects based on <code>milliseconds</code> property.
  Here's the array :</p>
  
  <pre><code>[
      {
          "name": "bug12755.xml",
          "list": "bugs42",
          "start-date": "2015-09-14",
          "age": {
              "text": "7 months",
              "milliseconds": 18381227304
          }
      },
      {
          "name": "bug12922.xml",
          "list": "bugs42",
          "start-date": "2015-08-27",
          "age": {
              "text": "8 months",
              "milliseconds": 19936427304
          }
      },
      {
          "name": "bug13183.xml",
          "list": "bugs50",
          "start-date": "2015-08-27",
          "age": {
              "text": "8 months",
              "milliseconds": 19936427305
          }
      }
  ]
  </code></pre>
  
  <p>I'm missing something fundamental about the <code>iteratee</code> function. I have this but does not seem to sort the array. Thanks in advance!</p>
  
  <pre><code> _.orderBy(list, function(item) {
              return item.age.value;
          }, ['desc']);
  </code></pre>