Biome elevation tweaks. Delete biomes.yml

Signed-off-by: Aleksi Sapon <QcTechs@gmail.com>
Fix for VANILLA-251. Also made the /hunger command work on server mode.

Signed-off-by: William Lebel <lebelwilliam@gmail.com>
Merge pull request #477 from greatman/master

Fix for VANILLA-251.