Merge pull request #747 from ahocevar/wpsexecute-mixin

Filter.v1 methods need to be available when using Filter writers. r=@bartvde

lib/OpenLayers/Format/WPSExecute.js

@@ -16,7 +16,8 @@
  * Inherits from:
  *  - <OpenLayers.Format.XML>
  */
-OpenLayers.Format.WPSExecute = OpenLayers.Class(OpenLayers.Format.XML, {
+OpenLayers.Format.WPSExecute = OpenLayers.Class(OpenLayers.Format.XML,
+                                            OpenLayers.Format.Filter.v1_1_0, {
     
     /**
      * Property: namespaces