Add DIY Fork Development Setup

I added a DIY development setup for anyone who wanted an alternative to the Virtualbox, Vagrant, Ansible route. This is the environment I use to create my blog posts and figured others would find it useful
Why Ruby 1.9.3, specifically? The current stable version is 2.1.2; 1.9.3 is pretty old and substantially slower, and rvm can fetch and build it just as easily.

Also, `--rails` shouldn't be there.