Update - init options: Rename displayLength to pageLength for consistency

- The displayLength option is poorly named, particularly with the new
  API refering to it as the page length (page.len()) so, using the new
  translation option to allow backwards compatiblity while using new
  parameter names, I've updated this parameter's name and its
  documentation.

.datatables-commit-sync

@@ -1 +1 @@
-9cb6d52a9a3e57a2327bc987d905ef8a55a3846b
+42f10dbe19b05e02886b82288f1ce7cdc83df0e0

media/js/jquery.dataTables.js

@@ -393,6 +393,7 @@
 		_fnCompatMap( init, 'orderFixed',    'aaSortingFixed' );
 		_fnCompatMap( init, 'paging',        'bPaginate' );
 		_fnCompatMap( init, 'pagingType',    'sPaginationType' );
+		_fnCompatMap( init, 'pageLength',    'iDisplayLength' );
 		_fnCompatMap( init, 'searching',     'bFilter' );
 	}
 	
@@ -9143,8 +9144,8 @@
 		 * position as the value, and the array in the second position as the
 		 * displayed options (useful for language strings such as 'All').
 		 *
-		 * Note that the `displayLength` property will be automatically set to the
-		 * first value given in this array, unless `displayLength` is also provided.
+		 * Note that the `pageLength` property will be automatically set to the
+		 * first value given in this array, unless `pageLength` is also provided.
 		 *  @type array
 		 *  @default [ 10, 25, 50, 100 ]
 		 *
@@ -10176,12 +10177,12 @@
 		 *  @default 10
 		 *
 		 *  @dtopt Options
-		 *  @name DataTable.defaults.displayLength
+		 *  @name DataTable.defaults.pageLength
 		 *
 		 *  @example
 		 *    $(document).ready( function() {
 		 *      $('#example').dataTable( {
-		 *        "displayLength": 50
+		 *        "pageLength": 50
 		 *      } );
 		 *    } )
 		 */