craft.conf

server {
  listen   80;

  root /var/www/craft.dev/public;
  index index.php index.html index.htm;

  server_name craft.dev;

  location / {
    try_files $uri $uri/ @rewrites;
  }

  location @rewrites {
    rewrite ^(.*) /index.php?p=$1 last;
  }

  location ~ \.php$ {
    try_files $uri =404;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_index index.php;
    include fastcgi_params;
  }

  error_page 404 /index.php;

}

general.php

<?php

/**
 * General Configuration
 *
 * All of your system's general configuration settings go in here.
 * You can see a list of the default settings in craft/app/etc/config/defaults/general.php
 */

return array(

/**
 * Whether generated URLs should be formatted using PATH_INFO, e.g. http://domain.com/index.php/path/,
 * as opposed to using the query string, e.g. http://domain.com/index.php?p=path
 *
 * Possible values: true, false, 'auto'
 */
'usePathInfo' => false,
'omitScriptNameInUrls' => true

);

For setup on Digital Ocean Ubuntu 12.04 x64

https://www.digitalocean.com/community/articles/how-to-install-linux-nginx-mysql-php-lemp-stack-on-ubuntu-12-04

You'll also need to install curl

Make sure to chown your public web folder to www-data:www-data so Craft can read above root.

Wish I'd thought to check your fork before spending ages trying to fix it myself 👍