Ore Tweaks

Added `NetherOreNests` generator. It generates nether quarts.
Added `NaturalPatches` generator. (I'm not sure if I like the name) It generates dirt and gravel.
The `OreNests` generator now only generates ores.
Or wait until c++11 and then we can use the vector override for an initalizer_list and uniform initialization to do that with the current datatype.