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/jscript/Scopeable.java

@@ -39,7 +39,7 @@ public interface Scopeable
     /**
      * Set the Scriptable global scope
      * 
-     * @param scope global scope
+     * @param script relative global scope
      */
     void setScope(Scriptable scope);
 }