Dota 2 Update - 6 September 2013

WORKSHOP:
- Added Abaddon to the Workshop submission tools and website requirements.


UI
- Added a button to add friends inside the game.
- Fixed bug where guild invites could never show up.
- Darkened background behind buff stack numbers for better legibility on bright icons.


MAC/LINUX:
- [Mac] Fixed problems with sounds cutting out or not playing for the first few minutes of a game.
- [Mac] Make Dock icon bounce when game is ready.
- [Mac] Play a ready sound when game is not focused and matchmaking has found a game.
- Make "Sound while alt-tab" setting work.
- Fix for missing lip syncing in hero portrait.
- Fix corrupted GUI after changing video settings.

VISUAL
- Fixed LOD1 on Ol' Chopper Pudge hook
- updated cloth settings and skinning Crystal Maiden, Invoker, Lina, and Rubick