FEAT: Send content with event

[marconneves]

In some cases the pixel event sends some conversion data, can I add support for it in your lib?

 _tfa.push({
    notify: 'event', 
    name: 'make_purchase', 
    id: 1317029, 
    revenue: '', 
    currency: '', 
    orderid: '', 
    quantity: ''
});