Getting the _session_id from SWFUpload

It appears that Ruby`s CGI::Session class will not use the _session_id in the query String when the Request is a POST.Normally, a POST-type request occurs when a form is submitted to the server (e.g. a Rails application). In this scenario, there is an easy workaround since we can send the _session_id as a hidden field.With Flash 8, however, there is no way to add a `hidden field` to the multi-part form data, thus Rails will FAIL to recognize the _session_id in the query string portion of our request.