title: gmaps4rails v2 not showing markes at same location
body: <p>I am using gmaps4rails in map which shows all users' locations. But if two or more users have the same location there only one marker on the map.
  How can I fix this? This my code for building the map:</p>
  
  <pre><code>@users=User.where('latitude is NOT NULL') 
  @hash = Gmaps4rails.build_markers(@users) do |user, marker|
  marker.lat user.latitude 
  marker.lng user.longitude 
  
  
  &lt;script type="text/javascript"&gt;
  var handler = Gmaps.build('Google');
  handler.buildMap({internal: {id: 'map'}, provider: {
  styles: myStyle
  }
  },function(){
  
  var markers = handler.addMarkers(&lt;%=raw @hash.to_json %&gt;);
  handler.bounds.extendWith(markers);
  handler.fitMapToBounds();
  });&lt;/script&gt;
  </code></pre>
  
  <p>Ps: I don't want to view them as a cluster</p>