Custom feed aggregator. Stack: requirejs (+text.js)+underscore+async+moment.js+jquery+handlebars

aggregator.js

define( ['jquery', 'underscore', 'async', 'moment', 'Handlebars'], 
	function($, _, async, moment, Handlebars) {

	var crossOriginFeedParserUrl = function(limit, feedUrl) {
		return document.location.protocol + 
			'//ajax.googleapis.com/ajax/services/feed/load?v=1.0&num='+
			limit+
			'&callback=?&q=' + 
			encodeURIComponent(feedUrl);
	},

	doAggregate = function(limit, target, feedUrl, callback) {
		$.ajax({
		    url: crossOriginFeedParserUrl(limit, feedUrl),
		    dataType: 'json',
		    success: function(data) {
		    	callback(null, data.responseData.feed.entries);
		    }
	  	});
	},

	sortEntries = function(limit, entries) {
		return _.sortBy(
				_.union.apply(_, entries),
				function (entry) {
					return -1 * moment(entry.publishedDate).unix();
				}
			).slice(0, limit);	
	},

	mergeEntries = function(postSkeleton, entries) {
		var template = Handlebars.compile(postSkeleton);

		return _.map(entries, function(entry) {
				return template({
					author: entry.author,
					contents: entry.contentSnippet,
					date: moment(entry.publishedDate).fromNow(),
					url: entry.link,
					title: entry.title
				});
			});
	},

	updateContents = function (limit, target, postSkeleton, error, success) {
		var entries = sortEntries(limit, success),
			feeds = mergeEntries(postSkeleton, entries);

		$(target).html(feeds);
	};


	return {
		aggregate: function(feedUrls, limit, target, postTemplate) {
			async.map(
				feedUrls, 
				_.partial(doAggregate, limit, target), 
				_.partial(updateContents, limit, target, postTemplate)
			);
		}
	}
});

example_post.tpl

<h3><a href="{{url}}" target="_blank">{{title}}</a></h3>
<p>By {{author}}, <span class="date">{{date}}</p>
<blockquote cite="{{url}}">
        {{{contents}}}
</blockquote>

main.js

require(['jquery', 'moment', 'aggregator', 'text!example_post.tpl'], 
	function($, moment, aggregator, postTemplate) {

		moment.lang('fr');
		
		var feedUrls = [
        		'http://www.eventuallycoding.com/index.php/feed/',
        		'http://florent.biville.net/?feed/atom',
        		'http://www.java-freelance.fr/feed',
        		'http://ogirardot.wordpress.com/feed/'
		];

		aggregator.aggregate(
        		feedUrls, 
        		10,
        		$('#feeds'),
        		postTemplate
		);
	}
);