JQMobi + PhoneGap: Ajax Deferred promise methods not working

I've been over this for the past entire two days. I assume that JQMobi(Intel AppFramework) is a light version of JQuery plus a customized UI framework for mobile devices (iOS and Android). Read a lot about JQuery Deferred() methods in many websites and blogs, and tried to implement some examples in a phonegap project of mine that uses JQMobi. My ajax calls are been fired correctly, and success callback is successful:

$.ajax({
        url: 'http://drsolution.com.br/teste/texts.json',
        async: true,
       dataType:'json',
       success: function(data)
        {
         // do something with the json object, THIS IS ALWAYS WORKING
        },
       error: function(error)
       {
        console.log("error");
       }

      });

But when I try to use the deferred callback methods in the promise object returned by the ajax call, I get no response from them:

$.ajax({
        url: 'http://drsolution.com.br/teste/texts.json',
        async: true,
        dataType:'json',
        success: function(data)
        {
         // do something with the json object, THIS IS ALWAYS WORKING
        },
        error: function(error)
        {
          console.log("error");
        }

        }).done(function{
                        // never fired
                        }).fail(function {
                                         // never fired
                                         }).always(function {
                                                            //never fired
                                                            });

What is happening ? The deferred object is not implemented in JQMobi (Intel AppFramework) ?

Thank you in advance.

notice I'm the author of App Framework

App Framework (jqMobi) is NOT jQuery. It provides syntax similar to jQuery.

deferred/done/fail/always are not implemented in App Framework.