updated lu request to handle FormData object

src/DataAccess/lu-request.js

                     url: url,
                     method: method,
                     params: dataGet,
-                    data: JSON.stringify(dataPost),
-                    headers: {
-                        'Content-Type': "application/json"
-                    }
+                    headers: {}
                 };
+                if (dataPost != null && dataPost.constructor === FormData) {
+                    params.data = dataPost;
+                    params.headers['Content-Type'] = undefined;
+                }
+                else {
+                    params.data = JSON.stringify(dataPost);
+                    params.headers['Content-Type'] = 'application/json';
+                }
 
                 for (var i = 0; i < luRequest.hooks.before.length; ++i) {
                     luRequest.hooks.before[i](url, method, dataGet, dataPost, luBusyGroups);