Update to Minecraft 1.6.1

TODO:
- rotate hay bales correctly
- remove small ponds from the desert in the default configs
- fix bugs that pop up
Removed water lakes from the desert in the default configs

This is to reflect a change made by Mojang to the vanilla generator.

Also made the defaults protected, so that it is possible to extend
BiomeConfig with your own default settings.
Added rotation for hay blocks and jungle/spruce/birch stairs
Fix skylight calculation in setBlock. Fixes #174
Merge remote-tracking branch 'upstream/master'