Gulliver (or Gulliver Forged) should not be installed into the minecraft jar file or the mods folder.Don't open Minecraft 1.7 or 1.8 worlds in older versions of Minecraft!.
Works with Too Many Items, Rei's Minimap, Optifine, some Forges, Little Blocks, and more! Doesn't quite work with Smart Moving, Player API, More Player Models, and more! Try naming your Bat for even more useful features!