0.9.0

• BUG FIX: Make unsafe buckets auto-refill in survival mode.
• BUG FIX: Don't let safe water that replaces snow under a block with a
  non-zero data value flow as if unsafe.
• The /sb command with no arguments now defaults to an unsafe water
  bucket.
• Require an empty main hand, or an empty bucket, water bucket or lava bucket
  when giving the moderator a bucket with /sb. Don't keep adding more buckets
  to the moderator's inventory.
• Document ALL THE THINGS!