title: how to use ng-option to set default value of select element
body: <p>I've seen the documentation of the Angular select directive here: <a href="http://docs.angularjs.org/api/ng.directive:select">http://docs.angularjs.org/api/ng.directive:select</a>. 
  I can't figure how to set the default value. This is confusing: </p>
  
  <blockquote>
    <p>select as label for value in array</p>
  </blockquote>
  
  <p>Here is the object:</p>
  
  <pre><code>{
      "type": "select", 
      "name": "Service",
      "value": "Service 3", 
      "values": [ "Service 1", "Service 2", "Service 3", "Service 4"] 
  }
  </code></pre>
  
  <p>The html (working): </p>
  
  <pre><code>&lt;select&gt;&lt;option ng-repeat="value in prop.values"&gt;{{value}}&lt;/option&gt;&lt;/select&gt;
  </code></pre>
  
  <p>and then I'm trying to add an ng-option attribute inside the select element to set <code>prop.value</code> as the default option (not working).</p>
  
  <pre><code>ng-options="(prop.value) for v in prop.values"
  </code></pre>
  
  <p>What am i doing wrong?</p>