* make sure server_port headers are properly set in reverse proxied scenarios
* overwrite request and response classes to
* always apply reverse proxy environment changes (so far missing for tornado
context)
* strip cookie name suffixes from cookie names on requests and
* be sure to set cookie name suffixes for cookie names on responses
* include script root in path used for cookies
* some minor refactoring in octoprint.server setup routines
* removed ReverseProxied class (didn't work for tornado context)
* add unit tests for the whole reverse proxy, request and response customization
