Bukkit

• Additions
• Add option to set minimum players to start a round
• Add method for broadcasting to a single round
• Add config option to disable rollbacks entirely
• Add config option for displaying spectators on lobby signs
• Add config option to disable spectator flight
• Add a couple of convenience methods
• Add some new exception types
• Bug fixes
• Fix config option "rollback-logging" not doing anything
• Fix PvP being disabled for all players (not just spectators)
• Fix Round#addSpawn() (it always throws an NPE in 0.1.0)
• Fix players being immediately removed from rounds upon joining from another world
• Fix armor not being removed after a player is removed from a round
• Fix ConfigManager#setAllowJoinRoundWhilePreparing(boolean)
• Fix rollbacks not always working as expected
• Fix maximum players per round being completely ignored
• Fix NPE while rolling back arena on server start
• Fix miscellaneous NPEs
• Refactor MGPlayerDeathEvent to a more appropriate MGPlayerSpectateEvent
• Internal changes
• Documentation fixes
• Various optimizations

This is an alpha build. Therefore, potentially game-breaking bugs may be present. If you encounter any bugs at all, please submit a ticket and I'll be sure to fix it ASAP.

Also, please note that this version is not recommended for use in production. A few API methods may change between this build and the next, but after that things should remain stable. This is being published as basically a developer preview, so you may want to wait before making your plugin public until you have a chance to test it against the next version.