Update Bukkit for Minecraft 1.5.2
Spigot POM Changes.
Measure the duration of the entire timings run.
Improved Timings System

Enables "Timings on Demand" so you can enable/disable timings without server restart.
Tracks timings on sync events a plugin registers (Single and Repeating)
Tracks how many ticks a timed area has caused the server to lose due to taking too long.
Enables automatically pasting to paste.ubuntu.com so you can quickly review the results on aikar.co/timings.php
Add nag for bad plugins.
PlayerItemDamageEvent
InventoryClickEvent now can return if the click was a double click. Fixes Bukkit-4035.

 Added in MC 1.5 you can now double click an item which brings all items of that type onto your cursor from the container. There is currently no way to distinguish this from a normal click.