After adjusting to the new movements from Google to Git, one issue still persists.
http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus/images/m1.png Failed to load resource: the server responded with a status of 404 (Not Found)
What shall I do get the marker cluster rendered on the map, instead of a ? ?
I am using a coffee script:
class RichMarkerBuilder extends Gmaps.Google.Builders.Marker #inherit from builtin builder
  #override create_marker method
  create_marker: ->
    options = _.extend @marker_options(), @rich_marker_options()
    @serviceObject = new RichMarker options #assign marker to @serviceObject
  rich_marker_options: ->
    marker = document.createElement("div")
    marker.setAttribute 'class', 'marker_container'
    marker.innerHTML = @args.title
    _.extend(@marker_options(), { content: marker })
  infobox: (boxText)->
    content: boxText
    pixelOffset: new google.maps.Size(-140, 0)
    boxStyle:
      width: "300px"
  # override method
  create_infowindow: ->
    return null unless _.isString @args.infowindow
    boxText = document.createElement("div")
    boxText.setAttribute("class", 'marker_info_box') #to customize
    boxText.innerHTML = @args.infowindow
    @infowindow = new InfoBox(@infobox(boxText))
@buildMap = (markers)->
    handler = Gmaps.build 'Google', { builders: { Marker: RichMarkerBuilder} } #dependency injection
    #then standard use
    handler.buildMap { provider: {}, internal: {id: 'map'} }, ->
      markers = handler.addMarkers(markers)
      handler.bounds.extendWith(markers)
      handler.fitMapToBounds()