Added positionUp to Pointer

Author: Cryszon

src/input/Pointer.js

@@ -174,6 +174,11 @@ Phaser.Pointer = function (game, id) {
     * @property {Phaser.Point} positionDown - A Phaser.Point object containing the x/y values of the pointer when it was last in a down state on the display.
     */
     this.positionDown = new Phaser.Point();
+    
+    /**
+    * @property {Phaser.Point} positionUp - A Phaser.Point object containing the x/y values of the pointer when it was last released.
+    */
+    this.positionUp = new Phaser.Point();
 
     /**
     * A Phaser.Circle that is centered on the x/y coordinates of this pointer, useful for hit detection.
@@ -489,7 +494,9 @@ Phaser.Pointer.prototype = {
         this.withinGame = false;
         this.isDown = false;
         this.isUp = true;
-
+        
+        this.positionUp.setTo(this.x, this.y);
+        
         if (this.isMouse === false)
         {
             this.game.input.currentPointers--;