Using requirejs with Backbone

main.js

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

    paths: {
        backbone: '//cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min',
        underscore: '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min',
        jquery: '//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min'
    }

});