Prevent players respawning at vanilla spawn in the overworld.

 * As described in totemo/CutePVP@8b2722cb and the [wrap up for the 2013 CTF](https://nerd.nu/forums/index.php?/topic/472-moving-forward-preparations-for-ctf-take-2/?p=6647), fix a bug with bed spawns that could be exploited to warp to a central buff.
 * Bump the version to 2.0.1.