Add 'loadstart' and 'loadend' events to some of our exciting layers like WFS, GML, GeoRSS, and Text. tests to back it up. (Closes #808)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@4252 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/GeoRSS.js

@@ -67,6 +67,7 @@ OpenLayers.Layer.GeoRSS = OpenLayers.Class(OpenLayers.Layer.Markers, {
         OpenLayers.Layer.Markers.prototype.initialize.apply(this, [name, options]);
         this.location = location;
         this.features = [];
+        this.events.triggerEvent("loadstart");
         OpenLayers.loadURL(location, null, this, this.parseData);
     },
 
@@ -209,6 +210,7 @@ OpenLayers.Layer.GeoRSS = OpenLayers.Class(OpenLayers.Layer.Markers, {
             marker.events.register('click', feature, this.markerClick);
             this.addMarker(marker);
         }
+        this.events.triggerEvent("loadend");
     },
     
     /**