OS X Homebrew Installation

This removes & rebuilds the current instructions for installing Homebrew dependencies on OS X, particular the instructions around exercising the ``` --force ``` command from inside Homebrew to link OpenSSL. This is irresponsible and dangerous to advise, on several levels, and it’s also completely unnecessary. The patch is borrowed from Litecoin, and retains the attribution to the original author inside the document. The patch is much *much* safer than the current suggested alternative.