テンプレートに Tempo.js を使用しようとしていますが、ドキュメントがまばらです。jsFiddleではなくSOでやってみてください。
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<script type="text/javascript" src="https://raw.github.com/twigkit/tempo/master/tempo.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8">
var data = [
{'name':{'first':'Leonard','last':'Marx'},'nickname':'Chico','born':'March 21, 1887','actor': true,'solo_endeavours':[{'title':'Papa Romani'}]},
{'name':{'first':'Adolph','last':'Marx'},'nickname':'Harpo','born':'November 23, 1888','actor':true,'solo_endeavours':[{'title':'Too Many Kisses','rating':'favourite'},{'title':'Stage Door Canteen'}]},
{'name':{'first':'Julius Henry','last':'Marx'},'nickname':'Groucho','born': 'October 2, 1890','actor':true,'solo_endeavours':[{'title':'Copacabana'},{'title':'Mr. Music','rating':'favourite'},{'title':'Double Dynamite'}]},
{'name':{'first':'Milton','last':'Marx'},'nickname':'Gummo','born':'October 23, 1892'},
{'name':{'first':'Herbert','last':'Marx'},'nickname':'Zeppo','born':'February 25, 1901','actor':true,'solo_endeavours':[{'title':'A Kiss in the Dark'}]}
];
Tempo.prepare('marx-brothers').render(data);
</script>
</head>
<body>
<ol id="marx-brothers">
<li data-template>{{nickname}} {{name.last}}</li>
</ol>
</body>
</html>