title: "Not implemented" when calling showComposeNewEmailAsync
body: <p>On a Windows 8.1 Phone device a Cordova app plugin is accessing showComposeNewEmailAsync here is the code;</p>
  
  <pre><code>exports.open = function (success, error, args) {
  var props = args[0],
      email = exports.getDraftWithProperties(props);
  
  Windows.ApplicationModel.Email.EmailManager
      .showComposeNewEmailAsync(email)
      .then(function () {
          success();
      },
      function (err) {
          error(err);
      })
      .done(success, 
      function (err) {
          error(err);
      });
  };
  </code></pre>
  
  <p>I get an error of "Not Implemented", it would seem from other posts that this method is available on this platform. What am I missing?</p>