Added new setting for appending the port number

Useful for when the site is running on a non-standard port number.

Our scenario:

We have a server located behind a load balancer. Our sites are running on port 8080.

 The load balancer forwards requests for port 80 to the web server on port 8080.

Because port 8080 is an internal port only, redirects that append the port number don't work.

This setting allows us to turn port appending on or off.