Added setup_props function to prepare for adding multiple properties to generated classes

lib/class.js

@@ -182,7 +182,7 @@ function extend()
     prototype.parent = base.prototype;
 
     // set up the new class
-    attach_extend( new_class );
+    setup_props( new_class );
     new_class.prototype   = prototype;
     new_class.constructor = new_class;
 
@@ -191,11 +191,24 @@ function extend()
 
 
 /**
- * Attaches extend method to the given function's prototype
+ * Sets up common properties for the provided function (class)
  *
- * @param  {Function}  func  function to attach method to
+ * @param  {Function}  func  function (class) to attach properties to
  *
- * @return undefined
+ * @return  {undefined}
+ */
+function setup_props( func )
+{
+    attach_extend( func );
+}
+
+
+/**
+ * Attaches extend method to the given function (class)
+ *
+ * @param  {Function}  func  function (class) to attach method to
+ *
+ * @return  {undefined}
  */
 function attach_extend( func )
 {