- moved ruby functions into their own buffer
- removed org-babel-sessions.el
- drastically scaled down org-babel-comint.el (may grow later if we
find duplication between language buffers)
- removed org-babel-script.el
- adjusted org-babel-init.el to reflect new file layout
For the big breakthrough see `org-babel-ruby-evaluate' in
org-babel-ruby.el. This will be the model upon which all future
language evaluations will be built.