set a default EPSG:4326 externalProjection to the KML, OSM and GPX formats. r=pgiraud (closes #2424)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9975 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/KML.js

@@ -11,6 +11,7 @@
  * @requires OpenLayers/Geometry/Collection.js
  * @requires OpenLayers/Request/XMLHttpRequest.js
  * @requires OpenLayers/Console.js
+ * @requires OpenLayers/Projection.js
  */
 
 /**
@@ -122,6 +123,9 @@ OpenLayers.Format.KML = OpenLayers.Class(OpenLayers.Format.XML, {
             kmlIconPalette: (/root:\/\/icons\/palette-(\d+)(\.\w+)/),
             straightBracket: (/\$\[(.*?)\]/g)
         };
+        // KML coordinates are always in longlat WGS84
+        this.externalProjection = new OpenLayers.Projection("EPSG:4326");
+
         OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
     },