fix handle triggered event for Ajax queries

[mikhailov]

custom event 'jqv.field.result' triggers don't handle for now, because it should be covered by ajax callback. I've fixed it with rewrite _ajax

[mikhailov]

this code helps you to test:

$('#form input').bind('jqv.field.result', function(a,b,c) {
    console.info(c);
});

[posabsolute]

Look good to me