Adds ocaml-safepass-1.3

OCaml-safepass is a library offering facilities for the safe storage of
user passwords. By "safe" we mean that passwords are salted and hashed
using the Bcrypt algorithm. Salting prevents rainbow-table based
attacks, whereas hashing by a very time-consuming algorithm such as
Bcrypt renders brute-force password cracking impractical.

Homepage: http://ocaml-safepass.forge.ocamlcore.org/