 Uncaught TypeError: object is not a function

I'm not sure why this isn't working.  I am using the library from npm.  

```
ajax({
            method: "DELETE",
            url: "/api/v1/useraccount_settings/quick_work_sites/1"
        });

```

ajax exists, and i can call ajax.get(); etc, but I can't use the syntax described on the readme. 
