Send order_by and paging parameters via POST

The default behavior of appending ?order_by=... to the url is inconsistent with
this.options.ajaxSettings.type when it is set to POST.

With this patch, a back-end service can be configured to ignore GET parameters
all together, which could be good in some cases.

fixes: #272

dev/jquery.jtable.paging.js

@@ -398,7 +398,12 @@
             var jtStartIndex = (pageNumber - 1) * this.options.pageSize;
             var jtPageSize = this.options.pageSize;
 
+            if (this.options.ajaxSettings.type == 'POST') {
+				$.extend(this._lastPostData, {'jtStartIndex': jtStartIndex, 'jtPageSize': jtPageSize });
+                return url;
+            }
             return (url + (url.indexOf('?') < 0 ? '?' : '&') + 'jtStartIndex=' + jtStartIndex + '&jtPageSize=' + jtPageSize);
+
         },
 
         /* Creates and shows the page list.

dev/jquery.jtable.sorting.js

@@ -177,7 +177,12 @@
                 sorting.push(value.fieldName + ' ' + value.sortOrder);
             });
 
+            if (this.options.ajaxSettings.type == 'POST') {
+				$.extend(this._lastPostData, {'jtSorting': sorting.join(',') });
+                return url;
+            }
             return (url + (url.indexOf('?') < 0 ? '?' : '&') + 'jtSorting=' + sorting.join(","));
+
         },
 
         /* Overrides _createJtParamsForLoading method to add sorging parameters to jtParams object.
@@ -199,4 +204,4 @@
 
     });
 
-})(jQuery);
+})(jQuery);