Merge pull request #44 from Freaky/master

Add a fallback PKCS5_PBKDF2_HMAC for systems with OpenSSL < 1.0.0.
Add openssl-devel to list of Redhat/Centos dependencies.

Signed-off-by: David Klann <klann@wins.net>
Merge pull request #46 from dklann/master

Add openssl-devel to list of Redhat/Centos dependencies.
README: Add instructions for installing the FreeBSD port.

Signed-off-by: Thomas Hurst <tom@hur.st>