fixes #95 - Tester.assertSelectorExists not working

 CasperJS Changelog
 ==================
 
+2012-XX-XX, v0.6.6
+------------------
+
+- fixed [#95](https://github.com/n1k0/casperjs/issues/95) - `Tester.assertSelectorExists` was broken
+
 2012-03-28, v0.6.5
 ------------------
 

@@ -264,7 +264,7 @@ var Tester = function(casper, options) {
      * @param  String   message    Test description
      */
     this.assertSelectorExists = function assertSelectorExists(selector, message) {
-        return this.assert(this.exists(selector), message);
+        return this.assert(casper.exists(selector), message);
     };
 
     /**