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Game and client changes

• Introduced fatigue to the melee attack in versus mode. You will see a HUD display when your melee swing is cooling down
  
• Boomer vomit will now pass through common infected
  
• Addressed some surround sound detection issues
  
• Fixed a rare crash when exiting Left4Dead on Windows Vista
  
• Fixed a case where the complete all expert campaigns achievement was not being rewarded
  

• Corrected an issue where Windows based dedicated were sending spurious shutdown notifications to the master causing them to delist temporarily
  
• Fixed dedicated servers not resetting the versus team swap correctly--you could join a dedicated server that had a previous game that was swapped and arrive on the other team than what was selected in the lobby
  
• Renamed the tags for sv_search_key to use "key:" in the server tags instead of "sv_search_key." This should help with issues of the 63 character limit of server tags
  
• Fixed an occasional server crash related to voting