Updates for learning

I reorganized the templating process, copying the process illustrated here: https://github.com/madebydna/rails-templater.

I didn't want to do too much until I talk to you about how you actually want to use it, I imagine that if you do want to specify a ruby or rails version, you'll want a bootstrap_rails.rb file to change the local ruby version in rbenv before running rails new.

Lets discuss when you have a chance to look it over.