[transaction] rename transaction_data to data
Transaction.transaction_data is redundant. A transaction_data property is left
for backward compatibility. Deprecation mechanism will come in later changeset
<div id="ajaxroot">
<div class="ajaxHtmlHead">
<script src="http://foo.js" type="text/javascript"> </script>
<link rel="stylesheet" type="text/css" media="all" href="qunit.css" />
</div>
<h1>Hello</h1>
</div>