include ocamlnet 3.6.x metadata and restrict to <4.01.0 due to http://caml.inria.fr/mantis/view.php?id=6035
Merge pull request #796 from dsheets/ocamlnet

Restrict ocamlnet 3.6.0, 3.6.3, and 3.6.5 to OCaml < 4.01.0