Added renderOrder property.

Author: photonstorm

src/tilemaps/mapdata/MapData.js

@@ -109,6 +109,15 @@ var MapData = new Class({
          */
         this.orientation = GetFastValue(config, 'orientation', 'orthogonal');
 
+        /**
+         * [description]
+         * 
+         * @name Phaser.Tilemaps.MapData#renderOrder
+         * @type {string}
+         * @since 3.12.0
+         */
+        this.renderOrder = GetFastValue(config, 'renderOrder', 'right-down');
+
         /**
          * [description]
          *