Added new Blocks/Biomes from recent snapshots
Updated cold/warm infos of biomes
Merge branch 'master' into minecraft-1.7
New weather condition fixing code.

Fixing the weather conditions is now based on a snow line, i.e. the
highest Y value that can have snow naturally. That way we can simulate
the snow/ice placement of Minecraft 1.7.
Merge branch 'minecraft-1.7'
Removed hint to minecraft-1.7 branch. Is merged.