Add Callback options

Add **Callback options** from [jQuery-File-Upload](https://github.com/blueimp/jQuery-File-Upload/wiki/Options#callback-options)

Then just add callback as an option, for instance:

```javascript
$(function() {
    new PunkAveFileUploader({ 
       //other options
        'doneCallback': function(e, data) {
            alert(data.textStatus);
        }
        
    });
});
```