Add api documentation (#361)

you

2017-06-05 987cc5a6a425b1f9bcd9000608dc389a45c675a1

 technic/machines/register/compressor_recipes.lua

@@ -10,7 +10,7 @@

local recipes = {
   {"default:snowblock",          "default:ice"},
   {"default:sand 4",             "default:sandstone"},
   {"default:sand 2",             "default:sandstone"},
   {"default:desert_sand",        "default:desert_stone"},
   {"technic:mixed_metal_ingot",  "technic:composite_plate"},
   {"default:copper_ingot 5",     "technic:copper_plate"},
@@ -20,11 +20,11 @@
}

-- defuse the default sandstone recipe, since we have the compressor to take over in a more realistic manner
minetest.register_craft({
   output = "default:sand 4",
minetest.clear_craft({
   output = "default:sandstone",
   recipe = {
      {'group:sand', 'group:sand'},
                {'group:sand', 'group:sand'}
      {'group:sand', 'group:sand'}
   },
})