New gamepad target config property

Author: photonstorm

src/boot/Config.js

@@ -263,6 +263,11 @@ var Config = new Class({
          */
         this.inputGamepad = GetValue(config, 'input.gamepad', false);
 
+        /**
+         * @const {*} Phaser.Boot.Config#inputGamepadEventTarget - [description]
+         */
+        this.inputGamepadEventTarget = GetValue(config, 'input.gamepad.target', window);
+
         /**
          * @const {boolean} Phaser.Boot.Config#disableContextMenu - [description]
          */