September 06, 2013 Patch

{{Patch layout
 * source = http://www.dota2.com/news/updates/11416/
 * before = August 31, 2013 Patch
 * after =


 * notes =

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 of Crystal Maiden, Invoker, Lina and Rubick.