Fully updated to support new 1.8 blocks:

- Added Iron Trap Door support
- Added proper vertical and horizontal chaining for both Wooden and Iron Trap Doors
- Wooden Trap Door no longer gets out of sync when a sign is placed on a row/column of Trap Doors
- Added the 5 new fence gates (Birch, Acacia, Dark Oak, Jungle, & Spruce)
- Signs are no longer removed from the player's hand when in Creative Mode
- Added the new doors and trap door to the default redstone protection list
- Signs placed above the new doors now no longer returns "Nothing nearby to protect"