Spigot
EMC POM changes
Remove CraftBukkit "Feature" of ItemStack's having infinite use.
Add 2 events for better control of mob spawning (Natural and Spawners)
Add PlayerUseItem Event so we can control when an item is consumed.
Make Items not have a repair cost increase due to Anvil usage.
Add Custom Timings to various points
Try old 1.4.5 dig speed algorithm for better results.