initial Jekyll-ification of the design
get ready to host on heroku

- add gems
- add config.ru
- add Procfile
- add newrelic config

re:
- http://jbhannah.net/blog/2013/01/16/jekyll-on-heroku-without-rack-jekyll-or-custom-buildpacks.html
- https://gist.github.com/jbhannah/4551206