Add static properties for object

fn.extend.static.js

/**
 * Add static properties for object
 *
 * @param {object} properties - extendable properties
 * @param {object} obj - extended object
 */
extend: function(properties, obj) {
    var extended = properties.extended;
    for(var name in properties) {
        obj[name] = properties[name];
    }
    if (extended) extended(obj);
}