Bukkit

auto-update:
# Set 'check' to false to completely disable auto-updating. (You can still update the plugin with ingame commands)
  check: true
# Set 'update' to false to disable downloading and updating newer versions automatically.
  update: true
# If 'unsafeUpdate' is set to false it will only check and download an update if the versions of your server and the plugins fits. (e.g. a plugin version for Minecraft 1.8.1 won't be installed on a server for 1.7.9; a plugin version for Minecraft 1.8.1 WILL be installed on a server for 1.8.0, cause this ignores the 3rd digit)
  unsafeUpdates: false