add inventory images to chains mod

also some basic code style fixes: spaces/tabs, tiles/tile_images, etc.

chains/init.lua

@@ -1,29 +1,33 @@
 print("[Chains] v1.1")
 
 minetest.register_node("chains:chain", {
-    description = "Chain",
+	description = "Hanging chain",
 	walkable = false,
 	climbable = true,
 	sunlight_propagates = true,
 	paramtype = "light",
 	drops = "",
-    tile_images = { "Chain.png" },
+	tiles = { "Chain.png" },
+	inventory_image = "Chain.png",
 	drawtype = "plantlike",
 	groups = {cracky=3},
 	sounds =  default.node_sound_stone_defaults(),
 })
+
 minetest.register_node("chains:chain_top", {
-    description = "Chain Top",
+	description = "Hanging chain (ceiling mount)",
 	walkable = false,
 	climbable = true,
 	sunlight_propagates = true,
 	paramtype = "light",
 	drops = "",
-    tile_images = { "Chain_top.png" },
+	tiles = { "Chain_top.png" },
+	inventory_image = "Chain_top_inv.png",
 	drawtype = "plantlike",
 	groups = {cracky=3},
 	sounds =  default.node_sound_stone_defaults(),
 })
+
 minetest.register_node("chains:chandelier", {
 	description = "Chandelier",
 	paramtype = "light",
@@ -33,11 +37,13 @@ minetest.register_node("chains:chandelier", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	drops = "",
-    tile_images = { {name="Chandelier.png", animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}}},
+	tiles = { {name="Chandelier.png", animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}}},
+	inventory_image = "Chandelier_inv.png",
 	drawtype = "plantlike",
 	groups = {cracky=3},
 	sounds =  default.node_sound_stone_defaults(),
 })
+
 minetest.register_craft({
 	output = 'chains:chain 2',
 	recipe = {
@@ -46,6 +52,7 @@ minetest.register_craft({
 		{'homedecor:chainlink_steel'},
 	}
 })
+
 minetest.register_craft({
 	output = 'chains:chain_top',
 	recipe = {
@@ -53,6 +60,7 @@ minetest.register_craft({
 		{'homedecor:chainlink_steel'},	
 	},
 })
+
 minetest.register_craft({
 	output = 'chains:chandelier',
 	recipe = {