old_contents: define(['jquery', 'underscore', 'backbone', 'model_want', 'utils'], function($, _, Backbone, Models, Utils) {
  	Models.Wants = Backbone.Collection.extend({
  		model: Models.Want,
  		initialize: function() {
  			this.fetch({
  				dataType: 'json',
  				success: function(model, response, options) {
  					
  				},
  				error: function(model, response, options) {
  					if (response.status === 403) {
  						Utils.logIn();
  					}
  				}
  			});
  		},
  		parse: function(response) {
  			return response.listings;
  		}
  	});
  	return Models;
  });
new_contents: define(['jquery', 'underscore', 'backbone', 'model_want', 'utils'], function($, _, Backbone, Models, Utils) {
  	Models.Wants = Backbone.Collection.extend({
  		model: Models.Want,
  		initialize: function() {
  			this.fetch({
  				dataType: 'json',
  				success: function(model, response, options) {
  
  				},
  				error: function(model, response, options) {
  					if (response.status === 403) {
  						Utils.logIn();
  					}
  				}
  			});
  		},
  		parse: function(response) {
  			return response.listings;
  		},
  
  		comparator: function(first, second) {
  			var dateValue1 = first.get("date_start");
  			var dateValue2 = second.get("date_start");
  
  			var firstDate = Date.parse(dateValue1);
  			var secondDate = Date.parse(dateValue2);
  
  			var difference = secondDate - firstDate;
  			if (difference > 0) {
  				return 1;
  			} else if (difference == 0) {
  				return 0;
  			} else {
  				return -1;
  			}
  		}
  	});
  	return Models;
  });
subject: Add comparator to sort listings in reverse chronological order.