title: NgMap : map.showInfoWindow not displaying the info-window
body: <p>Infowindow is not beign displayed on click though the data is getting passed to the function. <strong>map.showInfoWindow</strong> is not functioning.
  Here's my html code </p>
  
  <pre><code>&lt;ng-map zoom="15" center="{{prospects[0].latitude}},{{prospects[0].longitude}}"&gt;
          &lt;marker position="{{prospect.latitude}},{{prospect.longitude}}" 
                  id="{{prospect.street_id}}" 
                  ng-repeat="prospect in prospects"
                  on-click="showInfo(prospect)"&gt;&lt;/marker&gt;
  
          &lt;info-window id="prospectInfo"&gt;
                      &lt;div ng-non-bindable=""&gt;
                          &lt;h2&gt;{{currentProspect.name}}&lt;/h2&gt;
                      &lt;/div&gt;
          &lt;/info-window&gt;
  &lt;/ng-map&gt;
  </code></pre>
  
  <p>and this is my controller code </p>
  
  <pre><code>       NgMap.getMap()
              .then(function(map) {
                  $scope.map = map;
              });
        $scope.showInfo = function(e, prospect){
              console.log(e);
              console.log(prospect);
              $scope.currentProspect = prospect;
              $scope.map.showInfoWindow('prospectInfo',this);
          }
  </code></pre>