Add animation for fire

mods/fire/README.txt

@@ -28,3 +28,5 @@ fire_small.ogg sampled from:
 fire_large.ogg sampled from:
   http://www.freesound.org/people/Dynamicell/sounds/17548/
 
+fire_basic_flame_animated.png:
+  Muadtralk

mods/fire/init.lua

@@ -2,8 +2,12 @@
 
 minetest.register_node("fire:basic_flame", {
 	description = "Fire",
-	drawtype = "glasslike",
-	tiles = {"fire_basic_flame.png"},
+	drawtype = "plantlike",
+	tiles = {{
+		name="fire_basic_flame_animated.png",
+		animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=1},
+	}},
+	inventory_image = "fire_basic_flame.png",
 	light_source = 14,
 	groups = {igniter=2,dig_immediate=3},
 	drop = '',