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
Add dummy /testfor command in Bukkit. Addresses BUKKIT-3813

This command only functions in command blocks so the bukkit command for it
simply spits out an error message.
Pull Contributing Guidelines and Requirements into CONTRIBUTING.md
Add link to CONTRIBUTING.md in README
Add missing new line to README.md
Remove point about squashing commits.
Use in-game name
Copy output to shared library folder
Use platform specific line separator to save config files BUKKIT-2368
Allow arguments to be supplied with server command aliases; BUKKIT-3134
The server bukkit.yml aliases section will pass arguments supplied along
with appending arguments supplied on the command line at execution time.