Update OCaml Type_conv to version 109.60.01.
Also keep the old version 3.0.5 around for compatibility with OCaml 3.12.1.
Update OCaml Batteries to version 2.2.0
Add OCaml Oasis

OCaml Oasis is a configure/build/install system for OCaml proget (like
Cabal for Haskell).

This commit also add a few small dependencies that where missing

  -  OCaml Data Notation (odn)
  -  ocamlify
  -  ocamlmod
Update OCaml react to version 2.4.3
Merge branch 'ocaml-oasis' of git://github.com/maggesi/nixpkgs

Ocaml oasis