Fix for issue phaserjs#917, replaces commit dc49cfc

Fix for issue phaserjs#917: Calling reset() on Sprite with a P2 body can result in body.data.world == null.
Calling addToWorld() would previously not check the _toRemove array, which could, if the timing were right, result in a Sprite being revived but then removed from the P2 World--the result of this being the Sprite's data would be in a mixed state causing it to appear visually but not function in the world.

src/physics/p2/Body.js

@@ -725,7 +725,7 @@ Phaser.Physics.P2.Body.prototype = {
             {
                 if (this.game.physics.p2._toRemove[i] === this)
                 {
-                    this.game.physics.p2._toRemove[i].splice(i, 1);
+                    this.game.physics.p2._toRemove.splice(i, 1);
                 }
             }
         }