Add new param to onResourceRequested callback function

[mbazalik]

As a developer I would like to be able to access the data part of POST request

In case following js code is evaluated on page:

$.ajax({
  url: '/test',
  type: 'POST',
  data: 'someTestingData'
});

requestData object is provides me with following:

Request (#31):

{
    "headers": [
        {
            "name": "Origin",
            "value": "https://SOMEURL.com"
        },
        {
            "name": "X-Requested-With",
            "value": "XMLHttpRequest"
        },
        {
            "name": "User-Agent",
            "value": "Mozilla/5.0 (Unknown; Linux x86_64) AppleWebKit/534.34 (KHTML, like Gecko) CasperJS/1.1.0-DEV+Phantomjs/1.8.1 Safari/534.34"
        },
        {
            "name": "Content-Type",
            "value": "application/x-www-form-urlencoded; charset=UTF-8"
        },
        {
            "name": "Accept",
            "value": "*/*"
        },
        {
            "name": "Referer",
            "value": "https://SOMEURL.com/buy"
        },
        {
            "name": "Content-Length",
            "value": "15"
        }
    ],
    "id": 31,
    "method": "POST",
    "time": "2013-04-11T14:44:20.099Z",
    "url": "https://SOMEURL.com/test"
}

As you can see, there is not any property which would give me a clue about the data part of reqyest

[vitallium]

Implemented in fcdd274