Courier

New:

• Colour codes (&0-&f) can be used in Letters (ticket #50)
• Don't let Postmen betray vanished players (ticket #51)
  • See new config option VanishDistance
• Letters can be erased from the database by dropping them & letting them despawn, or actively burning them in a furnace

Fixes:

• Letters are now rendered immediately instead of "striped".
• If the Courier Map file in the World folder had been overwritten, all Letters were rendered blank (ticket #91)
• If you installed a new Courier version before BukkitDev was updated, it would claim you needed to update (ticket #88)