* Allow use of SSL-terminating reserve proxy that doesn't set headers

NGINX and other SSL-terminating reverse proxies can use HTTP headers to include forwarding information. If your stack includes SSL-termination through a network load balancer, that won't happen. You can use config.assume_ssl to address that.

* I hate these warts

* Document the new setting

* Add autoload for AssumeSSL

* Add CHANGELOG notice