Bukkit

• Add: Prevent piston events if they move/destroy locked blocks. This is included under the "redstone protection" setting.
• Add: excluded_worlds config option. You can make the plugin be disabled by adding world names, e.g. world_mining, world_end or world_nether.
• Fix: API error prohibited access to the friends menu.

A detailed changelog can be found at 0.4.3...0.4.4.