Add 1.6 PlaySound command. Fixes BUKKIT-4489
Add 1.6 SpreadPlayers command. Fixes BUKKIT-4508
Add 1.6 effect clear functionality. Fixes BUKKIT-4473
Account for relative coordinates in PlaySound. Fixes BUKKIT-4639
Use in-game name
Use native snakeyaml DumperOptions to format with platform linebreak
Allow arguments to be supplied with server command aliases; BUKKIT-3134
The server bukkit.yml aliases section will pass arguments supplied along
with appending arguments supplied on the command line at execution time.
Update snakeyaml to 1.12; Adds BUKKIT-48, BUKKIT-3896

http://code.google.com/p/snakeyaml/wiki/changes
Issue 66 "Provide serialization with minimum layout change" is fixed in
snakeyaml 1.11 and addresses BUKKIT-48.

This commit also introduces an improved error message when a TAB is
attempted to be used for indentation.