CHANGED pass X-Forwarded-For/Proto

Accept X-Forwarded-For/Proto headers from proxy server (e.g. AWS ELB)
and pass them through to application.
FIXED share pass through code between configs
FIXED the previous fix
FIXED escape $
ADDED changelog like a proper maintained project
FIXED more escaping
ADDED support HTTPS protocol in CHECKS
FIXED missing pathname
FIXED broken dokku cleanup
ADDED forward X-Forwarded-Port as well
Merge remote-tracking branch 'upstream/master'