ajax tests: Replaced $ with jQuery.

test/data/test.html

 html text<br/>
 <script type="text/javascript">/* <![CDATA[ */
-testFoo = "foo"; $('#foo').html('foo');
+testFoo = "foo"; jQuery('#foo').html('foo');
 ok( true, "test.html executed" );
 /* ]]> */</script>
 <script src="data/test.js"></script>

test/data/test.js

 var foobar = "bar";
-$('#ap').html('bar');
+jQuery('#ap').html('bar');
 ok( true, "test.js executed");

test/data/test.php

 html text<br/>
 <script type="text/javascript">/* <![CDATA[ */
-testFoo = "foo"; $('#foo').html('foo');
+testFoo = "foo"; jQuery('#foo').html('foo');
 ok( true, "test.php executed" );
 /* ]]> */</script>
 <script src="data/test.js?<?php srand(); echo time() . '' . rand(); ?>"></script>

test/data/test2.html

 <script type="text/javascript">
 var testFoo = "foo";
-$('#foo').html('foo');
+jQuery('#foo').html('foo');
 ok( true, "test2.html executed" );
 </script>