Release of OCaml-safepass 1.0

This is the first stable release of OCaml-safepass, 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.