Fixed a bug in the save as functionality where

the filename of a tab would change but the
corresponding file would not, causing the old file
to be overwritten on save.

client/core/document.js

@@ -14,6 +14,10 @@ var Document = function(node, docValue){
         return node;
     }
 
+    this.setNode = function(newNode) {
+        return node = newNode;    
+    }
+
     this.hasValue = function(){
         return docValue !== undefined;
     }

client/ext/save/save.js

@@ -259,6 +259,7 @@ return ext.register("ext/save/save", {
                     model.load(node);
                     file = model.data;
                     fs.beforeRename(file, null, newPath);
+                    page.$doc.setNode(file);
                 }
 	            setTimeout(function () {
 	               if (panel.caption == "Saved file " + newPath)