criterion version bumps.

The previous version of criterion, i.e. <= 0.8.0.1, was creating
problems with hastache >=0.6 and we had explicitly added additional
constraints to keep hastache down. Now with the new version out, we
bump up the criterion version and lift the bound on hastache.
Added way to parse BE Words
RSA PKCS Signature scheme added
Added Diffie Hellman Key exchange
Added Raaz.DH