EM Crushes Gravel and Sand

Hello, world! My first mod!

It just adds crafting recipes for turning Expanded Matter crushed stone into gravel, and powdered stone into sand.

It also adds some very lazy compatibility recipes for converting EM crushed stones into Stoneworks crushed stones, and vice-versa. I recommend also including Stoneworks, though it shouldn't be a requirement for the non-Stoneworks features to work. 

For now, there is no way to make chalk or limestone gravel without Stoneworks, and no way to make chalk or limestone sand at all. I'll probably add a pulverizer recipe for turning those two gravels into sand at some point, and probably also a process for turning lime into limestone, then limestone into chalk.

There is also currently an issue where stoneworks aggregate recipes overlap with my recipes for gravel. This only really affects peridotite and bauxite, so I made those two recipes shapeless as a workaround.