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
Updated version to 1.5.2-R0.1 in pom.xml for BETA.
Updated version to 1.5.2-R0.2-SNAPSHOT for development towards next release.
Pulling all pending Bukkit-JavaDoc changes
Pulling Bukkit into Bukkit-Javadoc
Fix issues with Event.java.

Fixes include:
    Web formatting for the list of properties on isAsync()
    78 character line limit
    Clarify what getEventName() is
    Adding links to plugin manager event usage