Client
* Removed an infinite ammo exploit for molotovs
* The team swapping issue in Versus has been fixed
Add-on Campaign Support
* Players download third party campaigns as single .VPK file
* Players can manage and select add-on maps and campaigns via game UI
* Added matchmaking support and download/update prompt for add-on campaigns
* Custom campaign support in Leader boards
* If not already registered, left4dead.exe registers .VPK extension to allow automatic install of add-ons
* Servers and the steam API have been extended to allow servers to send up a list of keys for matchmaking up to 1200 bytes in size
Left 4 Dead Authoring Tools
* Fixed missing fgd error
* Added vpk.exe command line tool for extracting, creating, and appending .VPK files
* Removed info_versus (not used)
* Added info_gamemode which fires outputs for Coop, Versus or Survival depending on what game mode the map is loaded in
* Updated tutorial_standards example map, repackaged as 'Dead Line' campaign example add-on
* Sample content now includes source files for official maps
