Remove unused attr_reader :caches in Meme
Try to improve meme performance, with the drawback of losing the ability
to change the body or behavior of it in an already bound method.
Backed out changeset 52114098192a - the performance gains were not
significant enough to be worth the loss in flexibility.

--HG--
extra : amend_source : 638328d357e9735cb9673b2c7d0f725d8d766afa