Correct way to redirect www to non www Ubuntu 14.04 VPS?

Tyler - Check out the following information for Apache:

http://httpd.apache.org/docs/current/rewrite/remapping.html

Description:
The goal of this rule is to force the use of a particular hostname, in preference to other hostnames which may be used to reach the same site. For example, if you wish to force the use of www.example.com instead of example.com, you might use a variant of the following recipe.
Solution:
The very best way to solve this doesn't involve mod_rewrite at all, but rather uses the Redirect directive placed in a virtual host for the non-canonical hostname(s).

<VirtualHost *:80>
  ServerName undesired.example.com
  ServerAlias example.com notthis.example.com

  Redirect / http://www.example.com/
</VirtualHost>

<VirtualHost *:80>
  ServerName www.example.com
</VirtualHost>

Most servers use Nginx now. For example Serverpilot on Digitalocean. So the correct way would be to use Nginx redirect.

create file with

if ($host ~* www.appname.com$) {
    return 301 http://appname.com$request_uri;
}

ant put in

/etc/nginx-sp/vhosts.d/appname.d/0www_redirect.conf

taken from http://techcat.ca/threads/nginx-force-www-to-no-www-domain-redirect-on-serverpilot-digitalocean.17/

I did this as the only change to my serverpilot config (so I left the main.conf as it was), but I get a too many redirects error. Any ideas? This is saweb.conf in nginx-sp/hosts.d:

server {
    listen       80;
    listen       [::]:80;
    server_name
        domainnamereplaced.com
        www.domainnamereplaced.com
      ;

    root   /srv/users/serverpilot/apps/saweb/public;

    access_log  /srv/users/serverpilot/log/saweb/saweb_nginx.access.log  main;
    error_log  /srv/users/serverpilot/log/saweb/saweb_nginx.error.log;

    proxy_set_header    Host              $host;
    proxy_set_header    X-Real-IP         $remote_addr;
    proxy_set_header    X-Forwarded-For   $proxy_add_x_forwarded_for;

    include /etc/nginx-sp/vhosts.d/saweb.d/*.nonssl_conf;
    include /etc/nginx-sp/vhosts.d/saweb.d/*.conf;
}