Make HopperMinecart implement InventoryHolder. Adds BUKKIT-3796
Add InventoryPickupItemEvent. Adds BUKKIT-3798
Add block or entity causes to BlockIgniteEvent. Addresses BUKKIT-3609, BUKKIT-3656, BUKKIT-3657
Add per-player Weather API. Adds BUKKIT-812
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