add tomato seeds

todo.md

 * [ ] orange trees from farming_plus
 * [x] carrot_seed
 * [ ] orange_seed
-* [ ] tomato_seed
+* [x] tomato_seed
 * [ ] potatoe_seed
 * [ ] rhubarb_seed
 * [ ] strawberry_seed

tomato.lua

@@ -4,6 +4,14 @@
 	http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1288375-food-plus-mod-more-food-than-you-can-imagine-v2-9)
 ]]
 
+minetest.register_craftitem("farming:tomato_seed", {
+    description = "Tomato Seeds",
+    inventory_image = "farming_tomato_seed.png",
+    on_place = function(itemstack, placer, pointed_thing)
+        return farming.place_seed(itemstack, placer, pointed_thing, "farming:tomato_1")
+    end
+})
+
 -- tomato
 minetest.register_craftitem("farming:tomato", {
 	description = "Tomato",
@@ -59,6 +67,7 @@ crop_def.tiles = {"farming_tomato_7.png"}
 crop_def.drop = {
 	items = {
 		{items = {'farming:tomato'}, rarity = 1},
+        {items = {'farming:tomato_seed'}, rarity = 1},
 		{items = {'farming:tomato'}, rarity = 3},
 	}
 }
@@ -70,6 +79,7 @@ crop_def.groups.growing = 0
 crop_def.drop = {
 	items = {
 		{items = {'farming:tomato 3'}, rarity = 1},
+        {items = {'farming:tomato_seed 4'}, rarity = 1},
 		{items = {'farming:tomato 3'}, rarity = 2},
 	}
 }