Minecraft server updated to 1.6.4

Completely missed this update as I was running the Oculas Rift build of minecraft and didn't have autoupdate running.

New features:

• Includes 1.6.3 fixes.
• 1.6.3 skipped, released as pre-release only.[2]
• Added server.properties option player-idle-timeout
• Kicks players from server when idle for that many minutes, defaults to disabled (0). 

• MC-15547 – Structures (witch huts, nether fortresses etc.) don't get saved with the world file
• In order for current structures (Witch Huts, Nether Fortresses, etc.) to be saved to the world file, the player must load the appropriate chunks within the game manually. The game will not automatically scan worlds and update structure data globally. After this is completed, structures will be compatible in all snapshots starting at Snapshot 13w37b
• Fixed handshake exploit