Heroku buildpack: Jekyll + Nginx

This is a Heroku buildpack for Jekyll sites. In contrast to Mark Pundsack's Jekyll buildpack, this buildpack embeds a copy of nginx in your app slug. This approach has several benefits:

• nginx is a smaller, more lightweight web server
• No need to start the Ruby interpreter, so your app boots faster
• nginx is evented, so can handle multiple HTTP requests at a time

Credit where credit's due

Honestly my contribution to this buildpack consisted mainly of judicious use of copy and paste. This is basically a mashup of heroku-buildpack-nginx and heroku-buildpack-jekyll. Thanks very much to Stephen Haynes and Mark Pundsack for those buildpacks. Thanks also to Marc Chung, who wrote another nginx buildpack I also used while developing this one.