Documentation Improvements

Bumps every http://openssl.org link to the correct https://openssl.org.
Also corrects the remnants of OpenSSL 1.0.1c to 1.0.1h. Also corrects
the OS X build instructions to have the correct link to Homebrew, the
correct OpenSSL check & removes the dangerous force link instructions.
With the patch provided by contrib/homebrew/makefile.osx.patch there is
*no need* to force the OpenSSL build onto the wider system.