RequireJS 2 config with jquery , underscore and backbone.js using schim

main.js

require.config({
	paths:{
		jquery:'libs/jquery/jquery',
		underscore:'libs/underscore/underscore',
		backbone:'libs/backbone/backbone'
	},
	shim:{
		underscore:{
			deps:[],
			exports:'_'
		},

		backbone:{
			deps:['underscore','jquery'],
			exports:function(){
				return Backbone.noConflict();
			}
		}
	}
});



require(['models/todo'],function(TodoModel){
	var todo = new TodoModel();

	console.log("its working from bootstrap and my name is : "+todo.get('content'));

});

todo.js

define(['jquery','backbone'],function($,Backbone){

  var TodoModels = Backbone.Model.extend({
      defaults:{
          content:'tareq jobayere'
      },
      initialize:function(){
          console.log("initialized todo model");
      }
  });



  return TodoModels;

});