* master:
Updated nginx to 1.11.6
Travis-CI's apt-get doesn't have --allow-downgrades yet, which is annoying because --force-yes is deprecated
Put --allow-downgrades in the right place
Upgrade docker-engine and allow downgrades
Clarified a couple parts in the README
Comment typo
Added httpoxy test
Updated README to reflect X-Forwarded-Port
Implemented more advanced webserver with routing and request header echoing, added header tests
Honor upstream forwarded port if available
add ssl_session_tickets to default site
Replace "replace" to "trimSuffix"
do not enable HSTS for subdomains
Remove proxy-tier network in favor of the default.
Added X-Forwarded-Port
Add docker-compose file for separate containers.
connect to uWSGI backends
Matthias Döring