Using the shim for non-AMD libraries and cdn calls.

Requirejs - shim

require.config({
    paths: {
        // use cdn default | fall back local copy 
        "jquery": [
            '//cdnjs.cloudflare.com/ajax/libs/jquery/2.0.0/jquery.min.js',
            'lib/jquery'
        ]
        "backbone": "vendor/backbone",
        "underscore": "vendor/underscore"
    },
    shim: {
        "backbone": {
            deps: [ "underscore" ],
            exports: "Backbone"
        },
        "underscore": {
            exports: "_"
        }
    }
});