pass macro context to skin.render

diff --git a/modules/helma/skin.js b/modules/helma/skin.js
index e35627b..b6e3928 100644
--- a/modules/helma/skin.js
+++ b/modules/helma/skin.js
@@ -38,7 +38,7 @@ function render(skinOrResource, context, scope) {
     } else {
         throw Error("Unknown skin object: " + skinOrResource);
     }
-    return skin.render(context);
+    return skin.render(context, scope);
 }
 
 /**
@@ -105,7 +105,7 @@ function Skin(mainSkin, subSkins, parentSkin) {
 
     var self = this;
 
-    this.render = function render(context) {
+    this.render = function render(context, macroContext) {
         // extend context by globally provided macros and filters.
         // user-provided context overrides globally defined stuff
         var configs = require('helma/webapp/env').configs;
@@ -115,7 +115,10 @@ function Skin(mainSkin, subSkins, parentSkin) {
                     context = Object.merge(context, require(module));
                 }
             }
-        }        
+        }
+        if (macroContext) {
+            context = Object.merge(context, macroContext);
+        }
         if (mainSkin.length === 0 && parentSkin) {
             return renderInternal(parentSkin.getSkinParts(), context);
         } else {