Make "Evented" write to the console when an error event is fired but no listeners are bound

[lucaswoj]

        if (!this.listens(type)) {
            if (util.endsWith(type, 'error')) {
                console.error(data && data.error && data.error.message);
            }
            return this;
        }

Not having this can cause errors to be silently ignored and unit tests to silently hang

[jfirebaugh]

⇢ #2447