add 'data' member to Marker class

git-svn-id: http://svn.openlayers.org/trunk/openlayers@89 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Marker.js

@@ -7,6 +7,11 @@ OpenLayers.Marker.prototype = {
     // latlon: {OpenLayers.LatLon} location of object
     latlon: null,
     
+    
+    /** the data object associated with the marker
+    * @type Object */
+    data: null,
+    
     // events
     events: null,