Ignore all .DS_Store files, not just the one in the project root.
Add method to get the source of a TNTPrimed. Adds BUKKIT-3815
Add ability to modify ThrownPotion properties. Adds BUKKIT-3197
Stationary lava is also a LAVA ignition cause.
Add BlockDropper for diff visibility
Implement Dropper interface. Adds BUKKIT-3750
Pulled upstream changes