jsen issue with $ref (https://github.com/bugventure/jsen/issues/29)

Warioworld.js

var jsen = require('jsen');

function validateAndOutput(schema, title, data) {
    var validate = jsen(schema);
    var result = validate(data);

    if (result) {
        console.log('Valid: ' + title + ' = ' + JSON.stringify(data));
    } else {
        console.log('Invalid: ' + title + ' = ' + JSON.stringify(data));
        console.log('Errors: ' + JSON.stringify(validate.errors));
    }
    console.log();
}

var mySchema = {
    id: 'http://example.com/schema#',
    type: 'array',
    items: {
        type: 'object',
        properties: {
            name: {
                type: 'string'
            },
            friends: {
                $ref: 'http://example.com/schema#'
            }
        },
        required: ['name']
    }
};

validateAndOutput(
    {'$ref': 'http://json-schema.org/draft-04/schema#'},
    'mySchema',
    mySchema
);

var myInvalidData = [
    {
        name: 'Mario',
        friends: [
            {
                name: 'Luigi',
                friends: []
            },
            {
                Wario: 'broken!'
            }
        ]
    }
];

validateAndOutput(
    mySchema,
    'myInvalidData',
    myInvalidData
);

var luigi = myInvalidData[0].friends[0];
console.log('Remove ' + luigi.name + "'s non-existent friends");
luigi.friends = undefined;

validateAndOutput(
    mySchema,
    'myInvalidData (reduced)',
    myInvalidData
);