Template extension spring configuration support

- similar pattern to existing script bean extension support
 - new root model helper objects and custom methods can be added via spring configuration
Cleanup of script extension spring support
Fix to thread safety of configured script extension beans that use the Scopable interface

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5369 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/template/Session.java

@@ -32,20 +32,20 @@ import org.alfresco.service.cmr.repository.TemplateImageResolver;
  * 
  * @author Andy Hind
  */
-public class Session
+public class Session extends BaseTemplateExtensionImplementation
 {
-
     private ServiceRegistry services;
 
-    @SuppressWarnings("unused")
-    private TemplateImageResolver imageResolver;
-
-    public Session(ServiceRegistry services, TemplateImageResolver imageResolver)
+    /**
+     * Sets the service registry
+     * 
+     * @param services  the service registry
+     */
+    public void setServiceRegistry(ServiceRegistry services)
     {
         this.services = services;
-        this.imageResolver = imageResolver;
     }
-
+    
     /**
      * Get the current authentication ticket.
      *