Mark logged-out landing page as must_be_mirrored.
Force SSL.
Set proxy ssl header.
Check cookie key fix.
Merge pull request #747 from jcushman/landing-mirror

Mark logged-out landing page as must_be_mirrored.
Merge pull request #748 from jcushman/force-ssl

Force ssl.
We might as well clear out the old .pyc files when we deploy.
Merge branch 'develop' of github.com:harvard-lil/perma into develop