[DoTA2 Update] 24.12.2014

[KAMIKADzE]

* Reworked how the Gift Wrap system works:
** Gift Wrap is now a free feature inside the game available to everyone.
** It can now be used with items that are temporarily untradeable (such as recent purchases), unless they have been previously Gift Wrapped.
** Hud Skins, Loading Screens, Wards, Announcers and Cursor Packs are now able to be Gift Wrapped.
** Players who have purchased Gift Wrap will receive some number of Treasure Redemption Tokens.
** Players who earned Gift Wrap by opening Treasure of the Nested Cache will receive some number of Treasures of the Nested Cache.
* Fixed various bugs in the Winter map.
* Fixed a recent change causing Chronosphere to affect invulnerable heroes when using abilities like Ball Lightning or Eul's Cyclone.