Pulling all pending Bukkit-JavaDoc changes
Updated version to 1.5.1-R0.2 in pom.xml for BETA.
Updated version to 1.5.1-R0.3-SNAPSHOT for development towards next release.
Add inverted flag support to TrapDoor. Fixes BUKKIT-3390
Update Bukkit for Minecraft 1.5.2
Move world generator warning to CraftBukkit. Fixes BUKKIT-2565