Bukkit/CraftBukkit — pull request #1302 by ZachBora (2013-12-19 19:29:14+00:00)
Title: Added setWorldGenerator

Added a function to set the world generator of a world. Useful when the
server owner does not know how to modify Bukkit.yml.

Associated issue : https://bukkit.atlassian.net/browse/BUKKIT-5208