refactor(client/js/ajax.requester.js): #898 - Allow caller to specify body for request
refactor(client/js/ajax.requester.js): #898 - Allow caller to specify body for request

The ajax requester base module is getting a bit hairy.  I will need to spend some time rethinking the API
and the logic used to determine the parameters and the body of the request.

FineUploader/fine-uploader,FineUploader/fine-uploader,FineUploader/fine-uploader