I advise updating to v1.1, as it fixes the bug where your skin doesn't reset after rejoining in vanish. Also added a permission for vanish (vanish.vanish. Only for v1.1+).
There are additional files for every version that disables join/leave messages for when you use /vanish.
When entering /vanish, the plugin removes you from the player (tab) list, whispers to you that you've entered /vanish, and notifies players that you've left.
When exiting /vanish, the plugin puts you back on the player (tab) list, whispers to you that you've exited /vanish, and notifies players that you've joined.
Requires OP, or the permission (vanish.vanish. Only for v1.1+).
As of right now there is no config file, and there's not enough content for me to add a config file.
Likely will be updated to work with future Minecraft versions.