0.5.0

• Remove need for compile flags @ Swift 4

Swift 4 Support

• random.h was renamed to rand.h in the latest version of OpenSSL served up by brew.
• Eliminated the need to add -Xcc -I/usr/local/opt/openssl/include/ to the Swift Build command line.
• Updated to fix build with PR #2.
• Added rsa.h.
• Added support for Swift 4.