Updated knockout library path in test runner

Author: sagacity

spec/runner.html

@@ -6,7 +6,7 @@
 	<link rel="stylesheet" href="lib/qunit.css" type="text/css" media="screen">
 	<script type="text/javascript" src="lib/qunit.js"></script>
 	<script type="text/javascript" src="lib/json2.js"></script>
-	<script type="text/javascript" src="https://raw.github.com/SteveSanderson/knockout/master/build/output/knockout-latest.debug.js"></script>
+	<script type="text/javascript" src="http://knockoutjs.com/downloads/knockout-2.2.0.debug.js"></script>
 	<script type="text/javascript" src="../knockout.mapping.js"></script>
 	<script type="text/javascript">
 		var curModuleName;