Add fedocal.proxy and set fedocal as an application behind a reverse proxy

This will ensure that flask.redirect is using ``https`` where asked.

Fixes https://fedorahosted.org/fedora-infrastructure/ticket/4369 for fedocal
Fix reverse proxy Thanks @ralphbean
Merge pull request #115 from fedora-infra/fix_https

Add fedocal.proxy and set fedocal as an application behind a reverse pro...