function Publisher(name) {
    this.name = name;
    this.subscribers = [];
}
Publisher.prototype.deliver = function (data, scope) {
    scope = scope || window;

    var self = this;

    this.subscribers.forEach(
        function (value) {
            value.call(scope, self.name, data);
        }
    );

    return this;
};
Function.prototype.subscribe = function (publisher) {
    var self = this,
        isExistent = publisher.subscribers.some(
            function (value) {
                return (value === self);
            }
        );

    if (!isExistent) {
        publisher.subscribers.push(this);
    }

    return this;
};
Function.prototype.unsubscribe = function (publisher) {
    var self = this;

    publisher.subscribers = publisher.subscribers.filter(
        function(value) {
            if (value !== self) {
                return value;
            }
        }
    );

    return this;
};