RetractableBridge

* The plugin now supports sound effects! If the SpoutPlugin plugin is installed
  on the server, and the user logs in with Spoutcraft, sound effects will be
  played whenever a bridge moves (over solid blocks, not over water or when
  floating in the air). For details about SpoutPlugin and Spoutcraft, see
  http://www.spout.org/.

  *Note:* the default sound effect is tuned for the default bridge speed. For
  this reason the sound effects are turned off by default if you have customised
  the speed in the config.yml file. You can force the sound effects to be
  enabled by adding the line "soundEffects: true" to the config file. You will
  probably also want to provide your own customised sound effect in this case.
  See http://dev.bukkit.org/server-mods/retractablebridge/pages/configuration/
  for details.
* Support for new Minecraft 1.4 block types has been added.
* Java 5 is no longer supported.