BlockState for Command Blocks.  Adds BUKKIT-3805.
Readd missed diff for minecart container size. Fixes BUKKIT-3826
Don't filter out -1 data in ItemStack. Fixes BUKKIT-3824
Handle filled buckets dispensing up and down. Fixes BUKKIT-3814
Really don't filter out -1 data in ItemStack.
test
Merge remote-tracking branch 'upstream/master'